Dungeon Geists

地下牢の霊 (Dungeon Geists) (ja)

Creature - Spirit | Power/Toughness: 3 / 3 (CMC 4)
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.