Enchantment — Aura, 1WW (3)
Uncommon
Enchant creature
Enchanted creature can't attack or block, and its activated abilities can't be activated.
Whenever a creature enters the battlefield under an opponent's control, you may attach Prison Term to that creature.
Illus. Zoltan Boros & Gabor Szikszai

5/1/2008: The last ability works only if Prison Term is already on the battlefield. You may move it from the creature it's currently enchanting onto the new creature.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern