Final-Sting Faerie
Morningtide — common
Creature — Faerie Assassin
Final-Sting Faerie rulings:
2008-04-01: The effect is mandatory. If you control the only creature that’s been dealt damage this turn, you must target that creature.
2008-04-01: The ability cares whether a creature has been dealt damage, not whether it still has damage on it. You can target a creature that was damaged and regenerated.