Tome of the Forsaken Arcanum

When you cast an instant or sorcery
you dont own, create a tapped 2/2 Zombie.
{x}, {t}: You may cast target instant or sorcery
from opponent’s graveyard with mana
value X. You may spend mana as though it
were mana of any color. If it would be put
into a graveyard, exile it instead.
Activate only as a sorcery.