Is Aang, the Last Airbender legal in Standard, Modern, and Commander?

Aang, the Last Airbender is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Aang, the Last Airbender

Q: What type of card is Aang, the Last Airbender?

Aang, the Last Airbender is a Legendary Creature — Human Avatar Ally. Its oracle text reads: "Flying When Aang enters, airbend up to one other target nonland permanent. (Exile it. While it's exiled, its owner may cast it for {2} rather than its mana cost.) Whenever you cast a Lesson spell, Aang gains lifelink until end of turn."

Legendary Creature — Human Avatar Ally

$0.18 ↗20 similarCommander, Modern

Flying

When Aang enters, airbend up to one other target nonland permanent. (Exile it. While it's exiled, its owner may cast it for rather than its mana cost.)