Claustrophobia

#20

Enchantment — Aura

Enchant creature When this Aura enters, tap enchanted creature. Enchanted creature doesn't untap during its controller's untap step.

Six feet of earth muffled his cries.

Legalities

standardpioneermodernlegacyvintagepaupercommanderbrawl

Rulings (2)

2015-06-22 Claustrophobia can target and enchant a tapped or untapped creature.
2015-06-22 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.