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LEG #107

Imprison

Enchantment — Aura
Imprison
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Imprison

Enchant creature Whenever a player activates an ability of enchanted creature with in its activation cost that isn't a mana ability, you may pay . If you do,counterthat ability. If you don't,destroythis Aura. Whenever enchanted creature attacks or blocks, you may pay . 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,destroythis Aura.

Card Information

Color: B
Identifies: B
Cost:
CMC: 1
Types: Enchantment
Subtypes: Aura
Rarity: rare
Languages:
Layout: normal

Official Rulings

2004-10-04
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.
2013-04-15
A mana ability is an ability that (1) isn't a loyalty ability, (2) doesn't target, and (3) could add mana when it resolves.