Whenever Azlask or another colorless creature you control dies, you get an experience counter.
: 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.
Flood the board with cheap colorless Scion and Spawn tokens, sacrifice them freely to ramp and to stack experience counters, then fire Azlask's WUBRG ability to give your whole team a massive +X/+X with indestructible, annihilator-1 Scions for an alpha strike. Early turns are about token engines and mana fixing; the midgame builds counters through deaths; the endgame is one big pump that ends the table.
Five-color identity means access to the entire card pool for ramp, removal, and tutors.
Tokens double as mana (Eldrazi Scions/Spawns sacrifice for mana) and as fuel for experience counters.
Experience counters persist through commander death, so removing Azlask doesn't reset your scaling payoff.
Annihilator 1 across a wide board can blow up opponents' permanents during the finishing swing.
Three-mana commander but the activated ability costs all five colors plus is mana-intensive, demanding excellent fixing.
Without enough experience counters the payoff is weak, so it has a slow ramp-up.
Board wipes that exile or hit before you activate (instant-speed) can undo a turn of setup.
Reliant on having creatures to pump—if your board is empty the ability does nothing.