Ghoulcallers Harvest

“Create X 2/2 black Zombie creature tokens with decayed, where X is half the number of creature cards in your graveyard, rounded up. <em>(A creature with decayed can't block. When it attacks, sacrifice it at end of combat.)</em> <br> Flashback 3BG <em>(You may cast this card from your graveyard for its flashback cost. Then exile it.)</em>”