Showstopper

Instant    (CMC:3)

Until end of turn, creatures you control gain "When this creature dies, it deals 2 damage to target creature an opponent controls."

The audience quickly realized a few things: it wasn't a magic trick, there wasn't candy in there, and they'd need new clothes.

102 DGM • ENSteve Prescott

™ & © 1993—2013 Wizards of the Coast

Legal in: Modern,Extended,Return to Ravnica Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Showstopper {1}{B}{R} Instant Until end of turn, creatures you control gain "When this creature dies, it deals 2 damage to target creature an opponent controls."

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4/15/2013
Creatures that come under your control after Showstopper resolves won't have the ability.
4/15/2013
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 his or her opponents controls as a target.

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Card Showstopper is not on TCGPlayer.