Is Azlask, the Swelling Scourge legal in Standard, Modern, and Commander?

Azlask, the Swelling Scourge is legal in: Legacy, Vintage, Commander, Historic.

What type of card is Azlask, the Swelling Scourge?

Azlask, the Swelling Scourge is a Legendary Creature — Eldrazi. Its oracle text reads: "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."

Azlask, the Swelling Scourge

Legendary Creature — Eldrazi

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.