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| kanji = １ターンに１{{ruby|度|ど}} | japanese = １ターンに１度 | furigana = １ターンに１ど | romaji = 1 Ichi Tān ni 1 Do | japanese translated = | english = once per turn | french = une fois par tour | german = einmal pro Spielzug | italian = una volta per turno | korean = 1턴에 1번 (1 Turn ? 1 番) ''1 Teon-e 1 Beon''|chinese =每回合1次 ''Měi Huíhé 1 Cì / Mui5 Wui4 hap6 1 Ci3''<br/>Formerly: 每1回合1次 ''Měi 1 Huíhé 1 Cì / Mui5 1 Wui4 hap6 1 Ci3'' | portuguese = uma vez por turno | spanish = una vez por turno

'''"Once per turn effects"''' are a kind of Some cards and [[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 a "Only once per turn effect". The third is typically referred to as an "Additional [[Normal Summon]] once per turn effect". ==Once per turn effects==These kinds of effects can only be seen by the fact that the effect starts with "once per turn" and possibly another [[Activation Requirement]] as well. Example:* activated '''Once once per turn:''' You can [[detach]] 1 [[Xyz Material]] from . There are three distinct ways in which this card, then [[target]] 1 [[Defense Position]] monster on the [[field]]; change it to [[face-up]] [[Attack Position]], and if you do, it loses 600 [[ATK]]limitation is commonly applied.

Typically, these kinds of effects are either [[Ignition Effects]] or [[Quick Effects]], but they can also be [[Trigger Effects]]. These kinds of effects can only be used once =="Once per turn as long as that specific "=={{Show card stays face-up on the field. For example, if image|Barrel Dragon|size=200px}}"[[Photon Papilloperative]]" [[activate]]s its effect, and then is later [[destroy]]ed that Once per turn, and "[[Xyz Reborn]]" is used to [[Special Summon]] it back from the [[Graveyard]], then you effects can once again use the effect as it has left be identified by the field, which "resetstext " the once per turn condition, thereby allowing it to activate once again. This principle also applies for Spell and Trap Cards. If you control multiple of the same card, you can activate both of " in their effects as well[[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 [[File:PhotonPapilloperative-SP14-EN-SFR-1Enegate]]d, it cannot be activated again that turn.png|center) 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 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.

==Only once per For example, if "[[Barrel Dragon]]" [[activate]]s its effect, it cannot activate its effect again that turn effects==These kinds 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 effects can be seen by the fact effect has either Haunted]]"You , it can only then activate 1 "X" per its effect again during that turn. Similarly, if a player controls two copies of " or Barrel Dragon"You , they can only activate/use the/this effect effects of "X" once per turn." Cards stating "once per Duel" instead work in both during the same way (they just apply for the entire Duel instead)turn.

Like with "A small number of cards have non-activated [[Continuous Effect]]s that also have a once per turn effectsclause (e.g. "[[ZW - Pegasus Twin Saber]]"). In their cases, these they can be Ignition Effects, Quick Effects or Trigger Effects; however, unlike them, these only each apply their effects can only be used once per turn, regardless of them being reset, or you having multiple copieswithout activating.

Japanese: このカード名の An exception to the above rules are monsters that specifically change themselves to [[face-down]] [[Defense Position]] (''Effect #''such as "[[Swarm of Locusts]]" and "[[Flip Flop Frog]]") 効果は１ターン（デュエル）に１度しか使用（発動）できない。(Kono kādo na no (''Effect #': 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') kōka waāō)s effect then flipped face-up once again, the effect will still reset.{{-}}

Example 1 ([[=="Only once per turn"=={{Main|Only once per turn}}{{Show card image|Spellbook of Secrets]]): |size=200px}}"Only once per turn" effects can be identified by one of the following [[Addcondition]] s: "You can only activate 1 "[[Spellbook]]X" per turn" or " card from your You can only activate/use [[Deck]] reference to your [[handeffect]], except of "X"[[Spellbook of Secrets]]once per turn". (Japanese: このカード名の (''Effect #''You can only activate 1 ) 効果は１ターンに１度しか使用（発動）できない。). Cards stating "once per Duel"Spellbook instead of Secrets" once per turn." (Japanese: ・・・(''Effect #'') 効果は１デュエルに１度・・・) work in the same way, but apply for the entire Duel instead.

This means you cannot activate multiple copies of The reference to the effect is most often "the effect" or "this effect", but can also be other references such as "Spellbook 1 of Secretsthese effects", since it states you can only activate one "each of them per turnthe preceding effects" etc. However, if depending on the activation structure of a cards with such statements is negated, you can activate it once againthe card's text.

Example 2 ([[Bacon Saver]]): During either player's [[Battle Step]], while If an [[attack]] is occurring: You can [[banish]] effect has this card from your Graveyard; [[negate]] the attack. '''You condition, each player can only use activate that effect of cards with the effect same name once per turn. This kind of condition is not affected by cards' names being changed; for example, if "[[Bacon SaverFairy Archer]]" once per activates its effect, even its name is changed by "[[DuelHero Mask]]" later that turn, it cannot activate its effect again that turn.<ref>{{cite book |author=Konami |title=Yu-Gi-Oh! Official Card Game - Perfect Rulebook 2015 |url=https://ygorganization.'''com/perfectrulebook/ |page=47}}</ref>

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.

This kind :Example 1 ("[[Spellbook of condition is not affected by cards' names being changed on the Secrets]]"): [[fieldAdd]]. For example, if 1 "[[Fairy ArcherSpellbook]]" activates its effectcard from your [[Deck]] to your [[hand]], even its name is changed by except "[[Hero MaskSpellbook of Secrets]]" later that . '''You can only activate 1 "Spellbook of Secrets" per turn.'''If a player activates "Spellbook of Secrets" and its activation is not negated, it this means that player cannot activate its effect the card "Spellbook of Secrets" again during that turn.<ref>{{cite book |author=Konami |title=Yu-Gi-Oh! Official Card Game - Perfect Rulebook 2015 |url=https://ygorganizationIf a player activates it and its activation was negated, the player may activate another one during the same turn if they have another one.com/perfectrulebook/ |page=47}}</ref>

:Example 2 ("[[Bacon Saver]]"): During either player's [[Battle Step]], while an [[Fileattack]] is occurring:SpellbookofSecrets-REDU-EN-UR-UEYou can [[banish]] this card from your Graveyard; [[negate]] the attack.png|center'''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.

==You can only gain this effect once per turn==Unlike 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 "Once per effects during the same turn.:Example 3 (" effects, these work a bit differently. These can be identified by the text [[Fluffal Bear]]"(): You can only gain [[send]] this effect once per turn.)". Most such effects allow card from your [[hand]] to the player to perform an additional [[Normal SummonGraveyard]]/; [[Normal Set]] 1 "[[Toy Vendor]]" directly from your [[Main Deck|SetDeck]] to your [[Spell & Trap Zone]] that turn without starting a . You can [[ChainTribute]]this card, but only one of these effects can be gained per turn. Even if the player controls both then [[target]] 1 "[[Polymerization]]"in your Graveyard; [[Evilswarm CastorAdd a card|add]]it to your hand. '''You can only use 1 " and Fluffal Bear"[[Fire Formation - Tensueffect]] per [[turn]], and only once that turn.'''If a player activates either effect of "Fluffal Bear", they cannot activate that effect again, or the player still can only gain the other effect of one to perform an extra Normal Summon, during that same turn.{{-}}

Example:* =="During the You can only gain this effect once per turn "=={{Main|Gain this effect once per turn}}{{Show card was Normal Summoned, you image|Constellar Pollux|size=200px}}These effects can Normal Summon 1 "[[lswarm]]be identified by the text " monster in addition to your Normal Summon/[[Normal Set|Set]]. '''(You can only gain this effect once per turn.)'''".

Cards and Each player can only apply one effect with this text per turn, even if the cards have different names or different effects that start a [[Chain]]. For example, then perform even if the Normal Summon immediately after [[Resolve|resolving]] (such as player controls both "[[PahunderEvilswarm Castor]]" and "[[Ultimate OfferingFire Formation - Tensu]]") as well as cards and effects that change , the player can only gain the maximum number effect of one to perform an extra Normal Summon/Sets that turn (such as .<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 "[[Double Summon]]Swap Frog" and or the monster effect of "[[Chain Summoning]]Atlantean Heavy Infantry") can still be used, regardless of if an effect that specifies "(You can only gain this effect once per turnwhen I Summon a monster? |url=https://www.db.yugioh-card.)" was used that turncom/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 [[File:ConstellarPollux-HA07-EN-SRNormal Summon]]/[[Normal Set|Set]] that turn without starting a [[Chain]]. The only cards with this text that do not have such an effect are "[[Zefraath]]" (which grants an additional [[Pendulum Summon]]) and "[[Dice Re-1E.png|centerRoll]]" (which allows a player to redo a dice roll).{{-}}