Claustrophobia

Enchantment — Aura    (CMC:3)

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.

46 M14 • ENRyan Pancoast

™ & © 1993—2013 Wizards of the Coast

Legal in: Modern,Innistrad Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

Claustrophobia {1}{U}{U} Enchantment — Aura Enchant creature When Claustrophobia enters the battlefield, tap enchanted creature. Enchanted creature doesn't untap during its controller's untap step.

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6/22/2015
Claustrophobia can target and enchant a tapped or untapped creature.
6/22/2015
The enchanted creature can still be untapped in other ways. Claustrophobia will remain attached, and the creature will continue to not untap during its controller’s untap step.

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Card Claustrophobia is not on TCGPlayer.