Friend Of Darkness

As an additional cost to cast this spell, sacrifice a creature.
Search your library or graveyard for a card with
the same converted mana cost as the sacrificed creature. Put that card into your hand. put a 2/2 black zombie creature token onto the battlefield.
Flashback - {2}{b}{b} and exile a card from your graveyard (You may cast this card from your graveyard for its flashback cost. Then exile it.)