Instant, W (1)
Common
Destroy target blocked creature.
"Sure, today of all days, he asked to borrow my boots!"
—Darijo, Ivy Street ruffian
Illus. Zoltan Boros

6/15/2010: A "blocked creature" is an attacking creature that has been blocked by a creature this combat, or has become blocked as the result of a spell or ability this combat. Unless the attacking creature leaves combat, it continues to be a blocked creature through the end of combat step, even if the creature or creatures that blocked it are no longer on the battlefield or have otherwise left combat by then.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Standard (Type 2)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern