Prison Term 
Enchantment — Aura
Enchant creature Enchanted creature can't attack or block, and its activated abilities can't be activated. Whenever a creature an opponent controls enters, you may attach this Aura to that creature.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL