Creature — Spirit 3/3, 2UU (4)
Rare
Flying
When Dungeon Geists enters the battlefield, tap target creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control Dungeon Geists.
Illus. Nils Hamm

1/22/2011: If another player gains control of Dungeon Geists, the creature will no longer be affected by the ability preventing it from untapping, even if you later regain control of Dungeon Geists.
1/22/2011: If you gain control of the creature that's being prevented from untapping, that creature won't untap during your untap step for as long as you control Dungeon Geists.
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