Moko'Throl, Undead Wizard

If a creature would die from damage dealt by a spell you control, put an X/X black Zombie creature token into play, where X is that spells converted mana cost
Sacrifice X creatures: You may cast a spell with converted mana cost X from your hand without paying its mana cost
"Surrender to me, and become a vessel for my power" -Moko'Throl, Undead Wizard