Is Appa, Steadfast Guardian legal in Standard, Modern, and Commander?

Appa, Steadfast Guardian is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Appa, Steadfast Guardian

Q: What type of card is Appa, Steadfast Guardian?

Appa, Steadfast Guardian is a Legendary Creature — Bison Ally. Its oracle text reads: "Flash Flying When Appa enters, airbend any number of other target nonland permanents you control. (Exile them. While each one is exiled, its owner may cast it for {2} rather than its mana cost.) Whenever you cast a spell from exile, create a 1/1 white Ally creature token. Power/Toughness: 3/4"

Legendary Creature — Bison Ally

Flash

Flying

When Appa enters, airbend any number of other target nonland permanents you control. (Exile them. While each one is exiled, its owner may cast it for rather than its mana cost.)

Whenever you cast a spell from exile, create a 1/1 white Ally creature token.

Power/Toughness: 3/4

Set Avatar: The Last Airbender

Rarity Mythic Rare

Mana Value 4

Artist Maël Ollivier-Henry

Collector # 10

Scryfall