Kreev, Apex Predator

Devour 3
At the beginning of your upkeep return a creature card from your graveyard to the battlefield tapped.
Embalm {5}{w}, Exile this card from your graveyard: Create a token that's a copy of this card, except it's white, it has no mana cost, and
it's a Zombie in addition to its other types. Activate this ability only any time you could cast
a sorcery.