These kinds of effects can be seen by the fact effect has either "You can only activate 1 "X" per turn" or "You can only activate/use the/this effect of "X" once per turn." Cards stating "once per Duel" instead work in the same way (they just apply for the entire Duel instead).
Example 1:* [[Add]] 1 Like with "[[Spellbook]]once per turn effects" card from your [[Deck]] to your [[hand]], except "[[Spellbook of Secrets]]". '''You these can be Ignition Effects, Quick Effects or Trigger Effects; however, unlike them, these effects can only activate 1 "Spellbook of Secrets" be used once per turn, regardless of them being reset, or you having multiple copies.'''
Example 2Japanese:* During either playerこのカード名の ('s [[Battle Step]], while an [[attack]] is occurring: You can [[banish]] this card from your Graveyard; [[negate]] the attack. '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。(Kono kādo na no ('You can only use the effect of "[[Bacon Saver]]" once per [[Duel]].'Effect #'') kōka waāō)
Like with Example 1 ([[Spellbook of Secrets]]): [[Add]] 1 "once per turn effects[[Spellbook]]"card from your [[Deck]] to your [[hand]], these can be Ignition Effects, Quick Effects or Trigger Effects; however, unlike them, these effects can only be used once per turn, regardless of them being reset, or you having multiple copies. This means you cannot activate multiple copies of except "[[Spellbook of Secrets]]", since it states you . '''You can only activate one 1 "Spellbook of them Secrets" per turn.'''
If the activation This means you cannot activate multiple copies of "Spellbook of a card that Secrets", since it states "You you can only '''activate''' this effect one of "card name" once them per turn" . However, if the activation of a cards with such statements is negated, then this means you can activate it once again. However Example 2 ([[Bacon Saver]]): During either player's [[Battle Step]], if 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 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.
This kind of condition is not affected by cards' names being changed on the [[field]]. 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.<ref>{{cite book |author=Konami |title=Yu-Gi-Oh! Official Card Game - Perfect Rulebook 2015 |url=https://ygorganization.com/perfectrulebook/ |page=47}}</ref>
