diff --git a/api/functions/Card/AddCannotBeFlipSummoned.yml b/api/functions/Card/AddCannotBeFlipSummoned.yml
new file mode 100644
index 00000000..c915099e
--- /dev/null
+++ b/api/functions/Card/AddCannotBeFlipSummoned.yml
@@ -0,0 +1,17 @@
+---!function
+name: AddCannotBeFlipSummoned
+namespace: Card
+description: >-
+  Creates and registers an [Effect](/api/types/Effect) to a monster card
+  that applies a "Cannot be Flip Summoned" Summoning condition to it
+summary: Adds a "Cannot be Flip Summoned" Summoning condition to a monster
+parameters:
+  - name: c
+    type: [ Card ]
+    description: The monster to register the effect to.
+returns:
+  - type: [ Effect ]
+    description: The registered effect.
+status:
+  index: stable
+tags: [ registers-effect ]
diff --git a/api/functions/Card/AddCannotBeNormalSummoned.yml b/api/functions/Card/AddCannotBeNormalSummoned.yml
new file mode 100644
index 00000000..8bdedc88
--- /dev/null
+++ b/api/functions/Card/AddCannotBeNormalSummoned.yml
@@ -0,0 +1,17 @@
+---!function
+name: AddCannotBeNormalSummoned
+namespace: Card
+description: >-
+  Creates and registers an [Effect](/api/types/Effect) to a monster card
+  that applies a "Cannot be Normal Summoned" Summoning condition to it
+summary: Adds a "Cannot be Normal Summoned" Summoning condition to a monster
+parameters:
+  - name: c
+    type: [ Card ]
+    description: The monster to register the effect to.
+returns:
+  - type: [ Effect ]
+    description: The registered effect.
+status:
+  index: stable
+tags: [ registers-effect ]
diff --git a/api/functions/Card/IsDifferentRace.yml b/api/functions/Card/IsDifferentRace.yml
index 0da857e6..d9c6960f 100644
--- a/api/functions/Card/IsDifferentRace.yml
+++ b/api/functions/Card/IsDifferentRace.yml
@@ -2,7 +2,7 @@
 name: IsDifferentRace
 namespace: Card
 description: >-
-  Returns if (Card c) does not have Race (int race)
+  Deprecated function. Use Card.IsRaceExcept
 status:
   index: stable
 parameters:
diff --git a/api/functions/Card/IsEffectMonster.yml b/api/functions/Card/IsEffectMonster.yml
new file mode 100644
index 00000000..a622b948
--- /dev/null
+++ b/api/functions/Card/IsEffectMonster.yml
@@ -0,0 +1,17 @@
+---!function
+name: IsEffectMonster
+namespace: Card
+description: >-
+  Checks if a card is currently an [Effect Monster](https://yugipedia.com/wiki/Effect_Monster).
+summary: Checks if a card is currently an Effect Monster.
+parameters:
+  - name: c
+    type: [ Card ]
+    description: The card to check.
+returns:
+  - type: [ bool ]
+    description: >-
+      `true` if the card is currently an Effect Monster, `false` otherwise.
+status:
+  index: stable
+tags: [ card-check, card-type-related ]
diff --git a/api/functions/Card/IsFusionMonster.yml b/api/functions/Card/IsFusionMonster.yml
new file mode 100644
index 00000000..d0bb91a2
--- /dev/null
+++ b/api/functions/Card/IsFusionMonster.yml
@@ -0,0 +1,17 @@
+---!function
+name: IsFusionMonster
+namespace: Card
+description: >-
+  Checks if a card is currently a [Fusion Monster](https://yugipedia.com/wiki/Fusion_Monster).
+summary: Checks if a card is currently a Fusion Monster.
+parameters:
+  - name: c
+    type: [ Card ]
+    description: The card to check.
+returns:
+  - type: [ bool ]
+    description: >-
+      `true` if the card is currently a Fusion Monster, `false` otherwise.
+status:
+  index: stable
+tags: [ card-check, card-type-related ]
diff --git a/api/functions/Card/IsPendulumMonster.yml b/api/functions/Card/IsPendulumMonster.yml
new file mode 100644
index 00000000..ae73adb9
--- /dev/null
+++ b/api/functions/Card/IsPendulumMonster.yml
@@ -0,0 +1,17 @@
+---!function
+name: IsPendulumMonster
+namespace: Card
+description: >-
+  Checks if a card is currently a [Pendulum Monster](https://yugipedia.com/wiki/Pendulum_Monster).
+summary: Checks if a card is currently a Pendulum Monster.
+parameters:
+  - name: c
+    type: [ Card ]
+    description: The card to check.
+returns:
+  - type: [ bool ]
+    description: >-
+      `true` if the card is currently a Pendulum Monster, `false` otherwise.
+status:
+  index: stable
+tags: [ card-check, card-type-related ]
diff --git a/api/functions/Card/IsRaceExcept.yml b/api/functions/Card/IsRaceExcept.yml
new file mode 100644
index 00000000..1969c22b
--- /dev/null
+++ b/api/functions/Card/IsRaceExcept.yml
@@ -0,0 +1,30 @@
+---!function
+name: IsRaceExcept
+namespace: Card
+description: >-
+  Checks if (Card c) has any race other than (int race). If the optional parameters are passed, does the checks by calling the equivalent behavior with such parameters with Card.GetRace
+status:
+  index: stable
+parameters:
+  - name: c
+    type: [ Card ]
+    description: (To be added)
+  - name: race
+    type: [ int ]
+    description: (To be added)
+  - name: scard
+    type: [ Card ]
+    description: (To be added)
+    required: false
+  - name: sumtype
+    type: [ int ]
+    description: (To be added)
+    required: false
+  - name: playerid
+    type: [ int ]
+    description: (To be added)
+    required: false
+returns:
+  - type: [ bool ]
+    description: (To be added)
+tags: [ under-construction ]
diff --git a/api/functions/Card/IsSynchroMonster.yml b/api/functions/Card/IsSynchroMonster.yml
new file mode 100644
index 00000000..fedee7ee
--- /dev/null
+++ b/api/functions/Card/IsSynchroMonster.yml
@@ -0,0 +1,17 @@
+---!function
+name: IsSynchroMonster
+namespace: Card
+description: >-
+  Checks if a card is currently a [Synchro Monster](https://yugipedia.com/wiki/Synchro_Monster).
+summary: Checks if a card is currently a Synchro Monster.
+parameters:
+  - name: c
+    type: [ Card ]
+    description: The card to check.
+returns:
+  - type: [ bool ]
+    description: >-
+      `true` if the card is currently a Synchro Monster, `false` otherwise.
+status:
+  index: stable
+tags: [ card-check, card-type-related ]
diff --git a/api/functions/Card/IsXyzMonster.yml b/api/functions/Card/IsXyzMonster.yml
new file mode 100644
index 00000000..dec26e5a
--- /dev/null
+++ b/api/functions/Card/IsXyzMonster.yml
@@ -0,0 +1,17 @@
+---!function
+name: IsXyzMonster
+namespace: Card
+description: >-
+  Checks if a card is currently an [Xyz Monster](https://yugipedia.com/wiki/Xyz_Monster).
+summary: Checks if a card is currently an Xyz Monster.
+parameters:
+  - name: c
+    type: [ Card ]
+    description: The card to check.
+returns:
+  - type: [ bool ]
+    description: >-
+      `true` if the card is currently an Xyz Monster, `false` otherwise.
+status:
+  index: stable
+tags: [ card-check, card-type-related ]
diff --git a/api/functions/Card/UpdateAttack.yml b/api/functions/Card/UpdateAttack.yml
index 1168e8fb..dd5dbc48 100644
--- a/api/functions/Card/UpdateAttack.yml
+++ b/api/functions/Card/UpdateAttack.yml
@@ -2,7 +2,7 @@
 name: UpdateAttack
 namespace: Card
 description: >-
-  Applies an ATK change to card c, equal to int amount. If the reset values (int reset) are not provided, the default is RESET_EVENT (+RESETS_STANDARD_DISABLE , if rc == c, or just +RESETS_STANDARD). If the reason card rc is not provided, uses as default card c. Returns the amount of ATK successfully changed.
+  Applies an ATK change to card c, equal to int amount. If the reset values (int reset) are not provided, the default is RESET_EVENT (+RESETS_STANDARD_DISABLE , if rc == c, or just +RESETS_STANDARD). If the reason card rc is not provided, uses as default card c. If reset_count is not provided it defaults to 1. Returns the amount of ATK successfully changed.
 status:
   index: stable
 parameters:
@@ -20,6 +20,10 @@ parameters:
     type: [ Card ]
     description: (To be added)
     required: false
+  - name: reset_count
+    type: [ int ]
+    description: (To be added)
+    required: false
 returns:
   - type: [ int ]
     description: (To be added)
diff --git a/api/functions/Card/UpdateDefense.yml b/api/functions/Card/UpdateDefense.yml
index 1c67adf4..890d174e 100644
--- a/api/functions/Card/UpdateDefense.yml
+++ b/api/functions/Card/UpdateDefense.yml
@@ -2,7 +2,7 @@
 name: UpdateDefense
 namespace: Card
 description: >-
-  Applies a DEF change to card c, equal to int amount. If the reset values (int reset) are not provided, the default is RESET_EVENT (+RESETS_STANDARD_DISABLE , if rc == c, or just +RESETS_STANDARD). If the reason card rc is not provided, uses as default card c. Returns the amount of DEF successfully changed.
+  Applies a DEF change to card c, equal to int amount. If the reset values (int reset) are not provided, the default is RESET_EVENT (+RESETS_STANDARD_DISABLE , if rc == c, or just +RESETS_STANDARD). If the reason card rc is not provided, uses as default card c. If reset_count is not provided it defaults to 1. Returns the amount of DEF successfully changed.
 status:
   index: stable
 parameters:
@@ -20,6 +20,10 @@ parameters:
     type: [ Card ]
     description: (To be added)
     required: false
+  - name: reset_count
+    type: [ int ]
+    description: (To be added)
+    required: false
 returns:
   - type: [ int ]
     description: (To be added)
diff --git a/api/functions/Cost/Choice.yml b/api/functions/Cost/Choice.yml
new file mode 100644
index 00000000..abb77e3c
--- /dev/null
+++ b/api/functions/Cost/Choice.yml
@@ -0,0 +1,15 @@
+---!function
+name: Choice
+namespace: Cost
+description: Creates a baseline [cost function](/api/types/EffectCost) that gives the player a choice between different baseline cost functions for the same effect (e.g. "Starliege Lord Galaxion"). The ellipsis (...) allows tables in the form {base cost function, effect description, additional check function} (e.g. "{Cost.DetachFromSelf(1),aux.Stringid(id,0),s.extracheck}"). [`Duel.SelectEffect`](/api/functions/Duel/SelectEffect) is used to have the player choose, and their choice is then set as the effect's label.
+summary: Creates a cost function that gives the player a choice between different costs.
+status:
+  index: stable
+parameters:
+  - name: ...
+    type: [ any ]
+    description: (To be added)
+returns:
+  - type: [ EffectCost ]
+    description: The cost function generated based on the given parameters.
+    guaranteed: true
diff --git a/api/functions/Cost/HardOncePerBattle.yml b/api/functions/Cost/HardOncePerBattle.yml
new file mode 100644
index 00000000..c9f3a60e
--- /dev/null
+++ b/api/functions/Cost/HardOncePerBattle.yml
@@ -0,0 +1,18 @@
+---!function
+name: HardOncePerBattle
+namespace: Cost
+description: Creates a baseline [cost function](/api/types/EffectCost) used for effects that can only be activated once per battle by a player.
+summary: Creates a cost function for "hard once per battle" effects.
+status:
+  index: stable
+parameters:
+  - name: flag
+    type: [ int ]
+    description: The value of the flag to register to the duel.
+returns:
+  - type: [ EffectCost ]
+    description: The generated cost function.
+    guaranteed: true
+suggestedLinks:
+  - name: Cost.SoftOncePerBattle
+    link: /api/functions/Cost/SoftOncePerBattle
diff --git a/api/functions/Cost/HintSelectedEffect.yml b/api/functions/Cost/HintSelectedEffect.yml
new file mode 100644
index 00000000..21b51124
--- /dev/null
+++ b/api/functions/Cost/HintSelectedEffect.yml
@@ -0,0 +1,39 @@
+---!function
+name: HintSelectedEffect
+namespace: Cost
+description: A baseline [cost function](/api/types/EffectCost) used for effects that need to display which effect was activated (e.g. "Exosister Gibrine").
+summary: Cost function for effects that need to display which effect was activated.
+status:
+  index: stable
+parameters:
+  - name: e
+    type: [ Effect ]
+    description: The effect being activated.
+  - name: tp
+    type: [ int ]
+    description: The player activating the effect.
+  - name: eg
+    type: [ Group ]
+    description: A group of cards associated to the event that prompted the effect activation. The specifics of this group vary depending on the [event code](/api/enums/Event).
+  - name: ep
+    type: [ int ]
+    description: The player associated to the event that prompted the effect activation.
+  - name: ev
+    type: [ Group ]
+    description: A value associated to the event that prompted the effect activation. The specifics of this value vary depending on the event code.
+  - name: re
+    type: [ Effect ]
+    description: The effect that caused the event that prompted the effect activation.
+  - name: r
+    type: [ int ]
+    description: Composite [Reason](/api/enums/Reason) value of the event that prompted the effect activation.
+  - name: rp
+    type: [ int ]
+    description: The player that caused the event that prompted the effect activation.
+  - name: chk
+    type: [ int ]
+    description: Must be `0` when checking if the cost can be paid, and `1` when performing the cost.
+returns:
+  - type: [ bool ]
+    description: If `chk` is `0`, returns `true` if the cost can be paid.
+    guaranteed: false
diff --git a/api/functions/Cost/RemoveCounterFromField.yml b/api/functions/Cost/RemoveCounterFromField.yml
new file mode 100644
index 00000000..49d4acf8
--- /dev/null
+++ b/api/functions/Cost/RemoveCounterFromField.yml
@@ -0,0 +1,18 @@
+---!function
+name: RemoveCounterFromField
+namespace: Cost
+description: Creates a baseline [cost function](/api/types/EffectCost) used for effects that remove a counter(s) from the activating player's field as cost, such as `You can remove 1 Spell Counter from your field... ; ...` (e.g. "Arcanite Magician").
+summary: Creates a cost function for effects that remove a counter from the field.
+status:
+  index: stable
+parameters:
+  - name: counter_type
+    type: [ int ]
+    description: The type of counter to remove.
+  - name: count
+    type: [ int ]
+    description: The amount of counters to remove.
+returns:
+  - type: [ EffectCost ]
+    description: The cost function generated based on the given parameters.
+    guaranteed: true
diff --git a/api/functions/Cost/RemoveCounterFromSelf.yml b/api/functions/Cost/RemoveCounterFromSelf.yml
new file mode 100644
index 00000000..a4377e46
--- /dev/null
+++ b/api/functions/Cost/RemoveCounterFromSelf.yml
@@ -0,0 +1,18 @@
+---!function
+name: RemoveCounterFromSelf
+namespace: Cost
+description: Creates a baseline [cost function](/api/types/EffectCost) used for effects that remove a counter(s) from the activating card itself as cost, such as `You can remove 1 Spell Counter from this card... ; ...` (e.g. "Breaker the Magical Warrior").
+summary: Creates a cost function for effects that remove a counter from the card itself.
+status:
+  index: stable
+parameters:
+  - name: counter_type
+    type: [ int ]
+    description: The type of counter to remove.
+  - name: count
+    type: [ int ]
+    description: The amount of counters to remove.
+returns:
+  - type: [ EffectCost ]
+    description: The cost function generated based on the given parameters.
+    guaranteed: true
diff --git a/api/functions/Cost/SelfChangePosition.yml b/api/functions/Cost/SelfChangePosition.yml
new file mode 100644
index 00000000..6a0b01ad
--- /dev/null
+++ b/api/functions/Cost/SelfChangePosition.yml
@@ -0,0 +1,15 @@
+---!function
+name: SelfChangePosition
+namespace: Cost
+description: Creates a baseline [cost function](/api/types/EffectCost) used for effects that change the battle position of the activating card itself as cost, such as `You can change this face-down card to face-up Defense Position; ...` (e.g. "Enneacraft - Atori.MAR").
+summary: Creates a cost function for effects that change the card's own position as cost.
+status:
+  index: stable
+parameters:
+  - name: position
+    type: [ int ]
+    description: The position to change the card to.
+returns:
+  - type: [ EffectCost ]
+    description: The cost function generated based on the given parameters.
+    guaranteed: true
diff --git a/api/functions/Cost/SoftOncePerBattle.yml b/api/functions/Cost/SoftOncePerBattle.yml
new file mode 100644
index 00000000..37b6265c
--- /dev/null
+++ b/api/functions/Cost/SoftOncePerBattle.yml
@@ -0,0 +1,18 @@
+---!function
+name: SoftOncePerBattle
+namespace: Cost
+description: Creates a baseline [cost function](/api/types/EffectCost) used for effects that can only be activated once per battle *per card*, e.g. "Lavalval Ignis".
+summary: Creates a cost function for "soft once per battle" effects.
+status:
+  index: stable
+parameters:
+  - name: flag
+    type: [ int ]
+    description: The value of the flag to register to the card.
+returns:
+  - type: [ EffectCost ]
+    description: The generated cost function.
+    guaranteed: true
+suggestedLinks:
+  - name: Cost.HardOncePerBattle
+    link: /api/functions/Cost/HardOncePerBattle
diff --git a/api/functions/Duel/GetReasonEffect.yml b/api/functions/Duel/GetReasonEffect.yml
new file mode 100644
index 00000000..bfdcd09e
--- /dev/null
+++ b/api/functions/Duel/GetReasonEffect.yml
@@ -0,0 +1,10 @@
+---!function
+name: GetReasonEffect
+namespace: Duel
+description: >-
+  Returns the [effect](/api/types/Effect) that the core considers as the "current effect" (`core.reason_effect`)
+status:
+  index: stable
+returns:
+  - type: [ Effect ]
+    description: (To be added)
diff --git a/api/functions/Duel/GetReasonPlayer.yml b/api/functions/Duel/GetReasonPlayer.yml
new file mode 100644
index 00000000..8e9724be
--- /dev/null
+++ b/api/functions/Duel/GetReasonPlayer.yml
@@ -0,0 +1,10 @@
+---!function
+name: GetReasonPlayer
+namespace: Duel
+description: >-
+  Returns the player that the core considers as the "current player" (`core.reason_player`)
+status:
+  index: stable
+returns:
+  - type: [ int ]
+    description: (To be added)
diff --git a/api/functions/Duel/GetTargetGroup.yml b/api/functions/Duel/GetTargetGroup.yml
new file mode 100644
index 00000000..f53f7386
--- /dev/null
+++ b/api/functions/Duel/GetTargetGroup.yml
@@ -0,0 +1,30 @@
+---!function
+name: GetTargetGroup
+namespace: Duel
+description: >-
+  [`Duel.GetMatchingGroup`](/api/functions/Duel/GetMatchingGroup) that also filters for [`Card.IsCanBeEffectTarget`](/api/functions/Card/IsCanBeEffectTarget) using [`Duel.GetReasonEffect`](/api/functions/Duel/GetReasonEffect)
+status:
+  index: stable
+parameters:
+  - name: f
+    type: [ function ]
+    description: (To be added)
+  - name: player
+    type: [ int ]
+    description: (To be added)
+  - name: s
+    type: [ int ]
+    description: (To be added)
+  - name: o
+    type: [ int ]
+    description: (To be added)
+  - name: ex
+    type: [ Group, Card, nil ]
+    description: (To be added)
+  - name: ...
+    type: [ any ]
+    description: (To be added)
+returns:
+  - type: [ Group ]
+    description: (To be added)
+tags: [ under-construction ]
diff --git a/api/functions/Effect/HasDetachCost.yml b/api/functions/Effect/HasDetachCost.yml
new file mode 100644
index 00000000..77386311
--- /dev/null
+++ b/api/functions/Effect/HasDetachCost.yml
@@ -0,0 +1,18 @@
+---!function
+name: HasDetachCost
+namespace: Effect
+description: >-
+  Returns true if the effect (Effect e) has a cost that detaches Xyz Material(s)
+status:
+  index: stable
+parameters:
+  - name: e
+    type: [ Effect ]
+    description: (To be added)
+  - name: type
+    type: [ int ]
+    description: (To be added)
+returns:
+  - type: [ bool ]
+    description: (To be added)
+tags: [ under-construction ]
diff --git a/api/functions/Effect/HasSelfDiscardCost.yml b/api/functions/Effect/HasSelfDiscardCost.yml
new file mode 100644
index 00000000..cd965e38
--- /dev/null
+++ b/api/functions/Effect/HasSelfDiscardCost.yml
@@ -0,0 +1,15 @@
+---!function
+name: HasSelfDiscardCost
+namespace: Effect
+description: >-
+  Returns true if the effect (Effect e) has a cost that discards the card itself
+status:
+  index: stable
+parameters:
+  - name: e
+    type: [ Effect ]
+    description: (To be added)
+returns:
+  - type: [ bool ]
+    description: (To be added)
+tags: [ under-construction ]
diff --git a/api/functions/Effect/HasSelfToGraveCost.yml b/api/functions/Effect/HasSelfToGraveCost.yml
new file mode 100644
index 00000000..cbe37431
--- /dev/null
+++ b/api/functions/Effect/HasSelfToGraveCost.yml
@@ -0,0 +1,15 @@
+---!function
+name: HasSelfToGraveCost
+namespace: Effect
+description: >-
+  Returns true if the effect (Effect e) has a cost that sends the card itself to the GY
+status:
+  index: stable
+parameters:
+  - name: e
+    type: [ Effect ]
+    description: (To be added)
+returns:
+  - type: [ bool ]
+    description: (To be added)
+tags: [ under-construction ]
diff --git a/api/functions/Link/AddProcedure.yml b/api/functions/Link/AddProcedure.yml
index 255ca080..902f4207 100644
--- a/api/functions/Link/AddProcedure.yml
+++ b/api/functions/Link/AddProcedure.yml
@@ -37,3 +37,10 @@ parameters:
     required: false
     defaultValue: |-
         The default string 1174: "Link Summon".
+  - name: spcon
+    type: [ function]
+    description: >-
+        An additional check equivalent to a Special Summon condition for the Link Monster (e.g. "Lib the World Key Blademaster").
+        Its signature is `(e,se,sp,st)` like the value function of a typical `EFFECT_SPSUMMON_CONDITION` effect.
+    required: false
+    defaultValue: nil