卡恩的同兆 (Karn's Sylex) (zhs)
Legendary Artifact (CMC 3)
Karn's Sylex enters the battlefield tapped.
Players can't pay life to cast spells or to activate abilities that aren't mana abilities.
, , Exile Karn's Sylex: Destroy each nonland permanent with mana value X or less. Activate only as a sorcery.