Disharmony | Magic: The Gathering
Formats Disharmony is Legal in
Official Oracle Text for Disharmony
Untap target attacking creature and remove it from combat. Gain control of that creature until end of turn.
Official Rulings for Disharmony
10/4/2004 : The creature untaps (if it was tapped) before you get control of it.
10/1/2008 : The current wording explicitly removes the creature from combat. It is no longer an attacking or blocking creature.
10/1/2008 : Disharmony can target a creature you control.
10/1/2009 : If you cast Disharmony during an opponent's turn, you may then block with the creature you gain control of (assuming there's an attacking creature it can block).
9/20/2013 : If a turn has multiple combat phases, this spell can be cast during any of them as long as it's before the beginning of that phase's Declare Blockers Step.