Draven, the Stormheart

Whenever a player sacrifices a creature, you may
pay {b}. If you do, draw a card and lose 1 life.
Whenever Draven deals combat damage to a
player, that player sacrifices a creature.
At the beginning of your upkeep, if three or
more creatures died last turn, put a +1/+1
counter on Draven, the Stormheart.