Once per turn " 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 a " Only once per turn effect " . The third is typically referred to as an " Additional Normal Summon once per turn effect " . " Once per turn " . " Once per turn " effects can be identified by the text " once per turn " in their 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 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 . " Only once per turn " . " Only once per turn " effects can be identified by one of the following condition s : " You can only activate 1 " X " per turn " or " You can only activate / use [ reference to effect ] of " X " once per turn " ( Japanese : このカード名の ( " Effect # " ) 効果は１ターン （ デュエル ） に１度しか使用 （ 発動 ） できない 。 ) . Cards stating " once per Duel " instead of " once per turn " work in the same way , but apply for the entire Duel instead . 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 an effect has this condition , each player can only activate that effect of cards with the same name once per turn . This kind of condition is not affected by cards ' names being changed ; for example , if " Fairy Archer " activates its effect , even its name is changed by " Hero Mask " later that turn , it cannot activate its effect again that turn . 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 . 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 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 " . 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 names . 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 . Most effects with this text allow the player to perform an additional Normal Summon / 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 ) .