+Kaervek (6)
Whenever an opponent casts a spell, Kaervek the Merciless deals damage to any target equal to that spell's converted mana cost.
Other creatures get -1/-1.
Kaervek's Hex deals 1 damage to each nonblack creature and an additional 1 damage to each green creature.
Destroy target creature with converted mana cost X. If that creature dies this way, Kaervek's Purge deals damage equal to the creature's power to the creature's controller.
As an additional cost to cast this spell, sacrifice all permanents you control and discard your hand.
Target player loses 5 life.
As long as Kaervek's Torch is on the stack, spells that target it cost more to cast.
Kaervek's Torch deals X damage to any target.
more to cast.