Parallax

+1: Put a -1/-1 counter on target nonblack nonartifact creature.
0: Parallax becomes a flying creature with fear and power and toughness equal to your devotion to
black.
-3: Draw a card for each black creature you control,
then discard a card.
-7: Target player separates all nonartifact creatures
they control into two piles. You choose one of those piles. That player sacrifices the chosen creatures.
{e}{4}