Imprison

Enchant Creature    (CMC:1)

Pay 1 each time target creature attempts to attack, block, or tap. That action is prevented and the creature becomes tapped. Destroy enchantment if mana is not paid.

LE • ENChristopher Rush

™ & © 1993—1994 Wizards of the Coast

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

Imprison {B} Enchantment — Aura 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, remove it from combat, and creatures it was blocking that had become blocked by only that creature this combat become unblocked. If you don't, destroy Imprison.

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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.
4/15/2013
A mana ability is an ability that (1) isn't a loyalty ability, (2) doesn't target, and (3) could put mana into a player's mana pool when it resolves.

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