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When Hooded Assassin enters the battlefield, choose one —
• Put a +1/+1 counter on Hooded Assassin.
• Destroy target creature that was dealt damage this turn.
If a creature was dealt damage but regenerated (which removes all damage from it), it will still be a legal target for the second mode of the triggered ability.
If a mode requires a target and there are no legal targets available, you must choose the mode that adds a +1/+1 counter.
You choose which mode you’re using as you put the ability on the stack, after the creature has entered the battlefield. Once you’ve chosen a mode, you can’t change that mode even if the creature leaves the battlefield in response to that ability.
