Boragoth, Gluttonous Tyrant

At the beginning of you upkeep, you may
sacrifice a creature. If you do, Boragoth,
Gluttonous Tyrant gains +X/+1 until end of
turn, where X is the sacraficed creature's
toughness.
If you sacrificed a creature this turn, create a 1/1
black and red zombie creature token.
The endless hunger of the undead is their only purpose