§ 383.3.e Core Rules PDF (officieel)

Some Triggered Abilities will trigger “once each turn,” or “N times each turn.” 1. Such a Triggered Ability will only be performed the specified number of times each turn. If its trigger condition would be fulfilled and it has already been performed that many times, it does not trigger. 2. If the Triggered Ability says “you may” or “they may” as the first part of its effect, its controller has the choice of whether or not it is performed. 2.a. During finalization of the Triggered Ability, the player who controls the Triggered Ability may choose to perform it. 2.b. If they do not, it is removed from the chain. Example: A player controls a unit that reads in part “Once each turn, when an enemy unit dies, you may banish it.” When an enemy Recruit token dies, the triggered ability goes on the chain. If they choose not to perform the ability on finalization, it is removed from the chain. When a Stalwart Poro dies later in the turn, they can choose to trigger it then.