Shadow Bind

Ritual {x}{w/b}{w/b}{w/b} (You may cast this spell for its
ritual cost if you cast it as a sorcery.)
Exile target creature or planeswalker until you
control no shadows, and create X 1/1 white and
black Shadow creature tokens. X is the
target card's mana value. If you cast Shadow
Bind as a ritual, the exiled card's owner exiles
up to X cards from their graveyard and you
create an addional token for each nonland card
exiled from a graveyard this way.