Clear out the cell. Bring in the next prisoner.

Prison Term

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.

Enchant creature
Enchanted creature can't attack or block and its activated abilities can't be played.
Whenever a creature comes into play under an opponent's control, you may attach Prison Term to that creature.

The List

Commander 2011

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.

Magic Online Theme Decks

Planechase

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.