Azlask, the Swelling Scourge (M3C 9)

Legendary Creature — Eldrazi • Mana cost: {3} • Modern Horizons 3 Commander • Mythic

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.

Illustrated by Cosmin Podar.