Shoggoth

Deathtouch, Indestructible
When Shoggoth enters the battlefield, each player sacrifices a Non-token creature. Shoggoth get X/X where X is the converted mana cost of all the sacrificed creatures
A shapeless congeries of protoplasmic bubbles, faintly self-luminous, and with myriads of temporary eyes forming and un-forming as pustules of greenish light