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506.3. The accountable player must acknowledge their triggers by the time they would have an observable impact on the game. If they do not, they are forgotten.
506.3.a. A trigger is considered forgotten once its point of observable impact has been reached and a new game action is taken without the accountable player acknowledging the trigger.
506.3.b. Players ruled to be abusing this rule to intentionally forget mandatory triggers that they are the accountable player for will be penalized. see 702.2 for more information about missed triggers as a penalty.
506.3.c. For triggers that occur “At the start of each player’s first
506.3.d. Examples of observable impact:
506.3.d.1. The trigger would change a point total. (Example card: Ahri, Alluring)
506.3.d.2. The trigger would change a rune total. (Example card: Startipped Peak)
506.3.d.3. The trigger would add a Buff token to a unit.
506.3.d.4. The trigger would impact combat or other game procedures. A card that reads “When you play a spell, give me +1 Might this turn.” does NOT have an immediate observable impact. (Example card: Ravenbloom Student)
506.3.d.5. A trigger would cause a player to draw or discard. (Example card: Traveling Merchant)
506.3.d.6. A trigger would cause a game object to be exhausted or readied. (Example card: Miss Fortune,
506.3.d.7. A trigger would cause a unit to move. (Example card: Stealthy Pursuer)
506.3.d.8. A player asks for public information that would be impacted by a trigger. See 502 for more information on public information.