Showstopper
Dragon's Maze — uncommon
Instant
Showstopper rulings:
2013-04-15: Creatures that come under your control after Showstopper resolves won’t have the ability.
2013-04-15: If another player gains control of a creature you control after Showstopper resolves, and then later that turn that creature dies, the creature’s controller when it died controls the triggered ability. That player chooses a creature that one of their opponents controls as a target.