When Yasuo Remorseful's attack trigger targets an enemy unit, and you respond by playing a discipline to increase his might before the trigger resolves, does the ability deal damage based on his might when triggered or when resolved?

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Accepted Answer

The damage uses Yasuo - Remorseful's Might when the attack trigger resolves. Playing Discipline in response (before the trigger resolves) will increase his Might and that increased value will be used when the trigger deals damage.

When Yasuo - Remorseful's attack trigger resolves it looks at his current Might to determine damage. Therefore a player may play Discipline in response to the attack trigger; the +2 Might from Discipline will be present when the triggered ability resolves and will increase the damage dealt. [359.3.f.2] [710]

Yasuo - Remorseful's attack creates a triggered ability and places it on the chain. Players may respond to that triggered ability before it resolves (for example by playing Discipline). Effects played in response that change Yasuo - Remorseful's Might resolve before the trigger resolves, updating his current Might on the board. When the triggered ability resolves, it deals damage equal to Yasuo - Remorseful's current Might (including any changes from Discipline). [359.3.f.2] [710]

If Yasuo - Remorseful is moved to a different zone such that the triggered ability's referenced information no longer applies (for example, "here" no longer references the battlefield because he was moved to base or a non-board zone), the trigger may mistarget and do nothing as described in [359.3.f.2]. Also note some triggered abilities reference information from the trigger condition itself instead of checking at resolution; that is not the case for "deal damage equal to my Might," which looks up current Might at execution. [359.3.f.2]

The key rule is that instructions which reference information like "my Might" are checked when the instruction is executed (i.e., when the triggered ability resolves), not when the trigger is placed on the chain. The rules explicitly use Yasuo - Remorseful as an example: if an effect (like a Stupefy) changes Yasuo's Might in response to his attack trigger, the attack trigger will deal damage equal to his current Might when it resolves. Therefore, if you play Discipline in response to Yasuo - Remorseful's attack trigger, the +2 Might from Discipline will be present when the trigger resolves and will increase the damage dealt. [359.3.f.2] [710]