Imprison

Enchantment - Aura, B (1)
Enchant creature
Whenever a player activates an ability of enchanted creature with {T} in its activation cost that isn't a mana ability, you may pay {1}. If you do, counter that ability. If you don't, destroy Imprison.
Whenever enchanted creature attacks or blocks, you may pay {1}. If you do, tap the creature and remove it from combat. Creatures it was blocking that had become blocked by only that creature this combat become unblocked. If you don't pay {1}, destroy Imprison.¹
Illus. Christopher Rush

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: Both abilities are triggered abilities. The first one triggers on the activating of a creature ability, and the second triggers on declaration of attacking or blocking.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard
Printings (1/2)	Legends (Rare)