Kalthor, Lich Mastermind

Whenever a creature you control dies, you may pay {w}{u}{b}. If you do, either gain life equal to the creature's combined power and toughness or draw a number of cards equal to the creature's converted mana cost.
{w}{w}{u}{u}{b}{b}: Return Kalthor, Lich Mastermind from your graveyard to your hand.