When a unit with an attack trigger (like Yasuo Remorseful) is moved or killed during a showdown after the trigger has been added to the chain, does the triggered ability still resolve and deal damage?

Ruling: Once a triggered ability is added to the chain, it always resolves regardless of whether the unit is killed or moved. However, if the ability references the unit's location (like "here") or stats (like "my might"), it may resolve to do nothing if the unit is no longer in the referenced location or no longer exists.

Sequence:

• Targets for the ability must be chosen when the ability is added to the chain
• If the unit is moved or killed after targets are chosen, the ability still resolves
• The ability checks its conditions upon resolution

Nuances:

• For Yasuo's ability specifically: if he is moved to a different battlefield or base, the chosen target is no longer valid for "here" so no damage is dealt
• If Yasuo is killed, he has no might to deal damage with, so the ability does nothing
• If an ability doesn't reference the unit's location or stats (e.g. "deal 5 damage to a unit"), it would still work even if the unit is moved or killed
• There is no "fizzling" like in Magic - abilities always resolve, they just potentially do nothing
• Any other effects on the ability would still resolve as much as possible
• Spells still count as played for effects like Ravenbloom Student even if they do nothing