Grim-Gûl, Underworld Guardian

{b}{w}, Sacrifice a creature you control: you gain
life equal to its converted mana cost.
{u}{b}: Return target creature card from your
graveyard to the battlefield, its a Zombie in
addition to its other types, you lose life equal to
its converted mana cost. Activate this ability only
any time you could cast a sorcery and only once
per turn.
{w}{u}: Zombies and Spirits you control get +1/+1
until end of turn.