If “using” or “playing” an Activated Ability is part of a trigger condition, that condition is fulfilled when the Activated Ability resolves.
§ 377.2.a Core Rules PDF (officieel)
§ 377 Activated Abilities are repeatable effects with a cost. They follow a process of going onto the chain and resolving, similar to Playing a Card. See rule 349. Playing Cards for more information.
§ 377.2 Card text will refer to activating Activated Abilities with the word “use” or “play.”
