Swan, Cat of Death

When Swan, Cat of Death enters the battlefield, mill 5 cards.
{10}{b}{b}: Swan, Cat of Death becomes a 12/12 Eldrazi Cat creature with Annihilator 7, deathtouch, indestructible, vigilance, infect, lifelink, and the ability: 'Your opponents can't win the game, and you can't lose the game.'