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→"Once per turn": this is true but Raidjin is probably not one of those monsters because it can flip anything, not just itself
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Some cards and [[card effect|effects]] can only be activated '''"Once once per turn effects"''' are a kind of [[card effect]]. There are three kinds of "Once per turn" effects. The first is typically referred to as a "Once per turn" effect. The second is typically referred to as an "Only once per turn" effect. The third distinct ways in which this limitation is typically referred to as an "Additional [[Normal Summon]]" effectcommonly applied.
=="Once per turn"==
"Once per turn" effects can be identified by the text "once per turn" in their [[activation requirement|activation conditions]].
These kinds of effects can only be used once per turn per card, while that card is face-up in its current location. (Even if that effect's activation is [[negate]]d, it cannot be activated again that turn.) This restriction only applies to that copy of the card; if a player is in [[possession]] of multiple cards with the same name that have the same "Once per turn" effect, they can activate each one during that turn. Additionally, if a card that activated its "Once per turn" effect changes locations leaves its current location (the entire field is considered the same location) or is flipped face-down, its effect can be activated again during that same turn.
For example, if "[[Barrel Dragon]]" [[activate]]s its effect, it cannot activate its effect again that turn while it remains face-up on the field. However, if after activating its effect it is [[destroy]]ed and sent to the [[Graveyard]], then [[Special Summon]]ed from the Graveyard by "[[Call of the Haunted]]", it can then activate its effect again during that turn. Similarly, if a player controls two copies of "Barrel Dragon", they can activate the effects of both during the same turn.
A small number of cards have non-activated [[Continuous Effect]]s that also have a once per turn clause (e.g. "[[ZW - Pegasus Twin Saber]]"). In their cases, they can only each apply their effects once per turn, without activating.
An exception to the above rules are monsters that specifically change themselves to [[face-down]] [[Defense Position]] (such as "[[Swarm of Locusts]]" and "[[Flip Flop Frog]]"): the same card cannot activate such an effect again for that turn after the next time it is flipped face-up. However, multiple copies can still use the effect once each, also if one such card leaves the field and then returns, or if it is flipped face-down by another card's effect then flipped face-up once again, the effect will still reset.
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=="Only once per turn"==
The reference to the effect is most often "the effect" or "this effect", but can also be other references such as "1 of these effects", "each of the preceding effects" etc. depending on the structure of the card's text.
If a card states "You can only '''use''' this effect of (''card name'') once per turn", then even if the activation is negated, you cannot activate it once again. On the other hand, if a card states "You can only '''activate''' this effect of (''card name'') once per turn", that effect can be activated again that turn if its activation is negated.
:Example 1 ("[[Spellbook of Secrets]]"): [[Add]] 1 "[[Spellbook]]" card from your [[Deck]] to your [[hand]], except "[[Spellbook of Secrets]]". '''You can only activate 1 "Spellbook of Secrets" per turn.'''If a player activates "Spellbook of Secrets" and its activation is not negated, this means that player cannot activate the card "Spellbook of Secrets" again during that turn. If a player activates it and its activation was negated, the player may activate another one during the same turn if they have another one.
:Example 2 ("[[Bacon Saver]]"): During either player's [[Battle Step]], while an [[attack]] is occurring: You can [[banish]] this card from your Graveyard; [[negate]] the attack. '''You can only use the effect of "[[Bacon Saver]]" once per [[Duel]].'''
If a player activates the effect "Bacon Saver", this means that player cannot activate the effect of "Bacon Saver" again during that same Duel, even if the activation of the effect was negated.
Some cards apply a single limitation to multiple effects. In that case, if a player activated any of those effects, they cannot activate any of the other effects during the same turn.
:Example 3 ("[[Fluffal Bear]]"): You can [[send]] this card from your [[hand]] to the [[Graveyard]]; [[Set]] 1 "[[Toy Vendor]]" directly from your [[Main Deck|Deck]] to your [[Spell & Trap Zone]]. You can [[Tribute]] this card, then [[target]] 1 "[[Polymerization]]" in your Graveyard; [[Add a card|add]] it to your hand. '''You can only use 1 "Fluffal Bear" [[effect]] per [[turn]], and only once that turn.'''
If a player activates either effect of "Fluffal Bear", they cannot activate that effect again, or the other effect, during that same turn.
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=="You can only gain this effect once per turn"==
These effects can be identified by the text "(You can only gain this effect once per turn.)".
Each player can only apply one effect with this text per turn, even if the cards have different namesor different effects. For example, even if the player controls both "[[Evilswarm Castor]]" and "[[Fire Formation - Tensu]]", the player can only gain the effect of one to perform an extra Normal Summon.<ref>{{cite web |title=「鬼ガエル」のモンスター効果と、「海皇の重装兵」のモンスター効果のどちらを適用して、モンスターを召喚するかを選べますか？ |trans-title=Can I choose whether to apply the monster effect of "Swap Frog" or the monster effect of "Atlantean Heavy Infantry" when I Summon a monster? |url=https://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=5&fid=12842&request_locale=ja |website=Yu-Gi-Oh! Official Card Game Card Database |publisher=Konami |access-date=22 June 2022 |date=24 March 2017}}</ref>
Most effects with this text allow the player to perform an additional [[Normal Summon]]/[[Normal Set|Set]] that turn without starting a [[Chain]], but only one of these effects can be gained per turn. The only cards with this text that do not have such an effect are "[[Zefraath]]" (which grants an additional [[Pendulum Summon]]) and "[[Dice Re-Roll]]" (which allows a player to redo a dice roll).
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==References==
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{{Gameplay}}
[[Category:Gameplay]]
