Vabiel, Fate Carver

Flying
Whenever a creature dies you may choose to exile
it. If you do, that creature's controller reveals the
top card and gains life equal to that card's
converted mana cost. If you don't, you may reveal
the top card of your library and put a +1/+1
counter on Vabiel, Fate Carver.
When Vabiel dies, remove it and all cards in your graveyard from the game.