Masters Edition III

Disharmony

Cast Disharmony only during combat before blockers are declared.
Untap target attacking creature and remove it from combat. Gain control of that creature until end of turn.

Cast this spell only during combat before blockers are declared.
Untap target attacking creature and remove it from combat. Gain control of that creature until end of turn.

Legends

Target attacking creature comes under your control untapped. Return to former controller at end of turn. This creature is no longer considered to have attacked. Play before defense is chosen.