Claustrophobia | Magic: The Gathering
Formats Claustrophobia is Legal in
Official Oracle Text for Claustrophobia
When Claustrophobia enters the battlefield, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
Official Rulings for Claustrophobia
9/22/2011 : The enchanted creature can still be untapped in other ways, such as by Village Bell-Ringer's ability.