Enchantment — Aura, 1UU (3)
Common
Enchant creature
When Claustrophobia enters the battlefield, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
Six feet of earth muffled his cries.
Illus. Ryan Pancoast

9/22/2011: Claustrophobia can target and enchant an untapped creature.
9/22/2011: The enchanted creature can still be untapped in other ways, such as by Village Bell-Ringer's ability.
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