Phrosc, Primal Devourer

Deathless - If this creature would die return it to
the battlefield tapped at the beginning of your next upkeep.
Whenever a creature dies put a hunger counter on Phrosc.
Hunger counters remain on Phrosc as it moves to
any zone other than the players hand or library.
Devour - {t}, Remove twenty hunger counters: Target player loses the game.