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Whenever a creature an opponent controls becomes the target of a spell or ability you control, gain control of that creature for as long as you control Willbreaker.
If Willbreaker leaves the battlefield, you no longer control it, and its control-change effect ends.
If another player gains control of Willbreaker, its control-change effect ends. Regaining control of Willbreaker won’t cause you to regain control of the creature.
If you lose control of Willbreaker before its ability resolves, you won’t gain control of the creature at all.
