Azlask, the Swelling Scourge is a mythic Legendary Creature — Eldrazi card from Modern Horizons 3 Commander (M3C), collector number 136. Current market price: — (foil $15.30), TCGplayer market prices via Scryfall.
Whenever Azlask or another colorless creature you control dies, you get an experience counter. {W}{U}{B}{R}{G}: Creatures you control get +X/+X until end of turn, where X is the number of experience counters you have. Scions and Spawns you control gain indestructible and annihilator 1 until end of turn.