Nora, Depravity's Herald

Whenever a creature card is put into a graveyard
from anywhere, you may exile it.
At the beginning of combat on your turn, target
player mills three cards, then you create an X/X
black Horror creature token with haste, where X
is the number of creature cards all players own in
exile. Sacrifice it at the beginning of the next end
step.
Choose a Home.