Imprison

Enchantment - Aura, B (1)
Enchant creature
Whenever a player plays an activated ability of enchanted creature with {T} in its cost that isn't a mana ability, you may pay {1}. If you do, counter that ability. If you don't, sacrifice Imprison.
Whenever enchanted creature attacks or blocks, you may pay {1}. If you do, tap the creature and remove it from combat. Creatures it blocked that no other creatures blocked this combat become unblocked. If you don't pay {1}, sacrifice Imprison.¹
Illus. Christopher Rush

Crystal Keep Rulings Summaries

• Both abilities are triggered abilities (see Rule 404). The first one triggers on the announcing of a creature ability, and the second triggers on declaration of attacking or blocking. [D'Angelo 1999/02/11]
• Extended tournaments (see Rule 803) have always banned this card.
• Note - Also see Aura, Rule G1.30.
• Note - This card was of type "Enchant Creature" until Oracle 2005/08/01.
• Note - There is a typo on this card. The gray circle for the generic mana cost accidentally appears one line above the "1"; it should be behind it.

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