Skithiryx, the Ruiner

Flying, haste
Whenever Skithiryx, the Ruiner deals combat damage to an opponent, that player gets two poison counters and you lose 2 life.
At the beginning of combat on your turn, if Skithiryx is in the graveyard, you may pay {3}{b/g}{b/g}. If you do, return Skithiryx from your graveyard to the battlefield and you lose 1 life.