Krovmir Souldrinker

Painborn (Each 1 life you pay while casting this
pays for {1}. It enters the battlefield with a -1/-1 counter on it for each 1 life paid this way.)
Contaminate - Whenever a player pays life to cast
a spell or activate an ability, you may exile a creature card from an opponent's graveyard. If
you do, Krovmir Souldrinker's base power and toughness become equal to that creature's power.