Liliana, Leader Of Death

+1: Flash, Whenever a creature you control dies, exile it with a buried counter +1 Add{b}{b}
-2: -2: Create a 3/1 Zombie token with "Sacrifice this creature, return a creature with a buried counter to the battlefield tapped. It's a zombie.
-6: For each black creature, you control in exile, in your graveyard, and on the battlefield. Create a tapped 2/2 zombie creature token.