Durnehviir, Cursed Dovah

Flying
Whenever Durnehviir, Cursed Dovah deals
combat damage to a player, that player mills
two cards. Create a 1/1 black Skeleton creature
token for each creature card milled this way.
You may cast Durnehviir, Cursed Dovah from
your graveyard by paying {1}{b}{b} and sacrificing
two creatures rather than paying its mana cost.