Is Lost in Memories legal in Standard, Modern, and Commander?

Lost in Memories is legal in: Legacy, Vintage, Commander, Historic.

Lost in Memories

Q: What type of card is Lost in Memories?

Lost in Memories is an Enchantment — Aura. Its oracle text reads: "Flash Enchant creature you control Enchanted creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost." (You may cast that card from your graveyard for its flashback cost. Then exile it.)"

Enchantment — Aura

Flash

Enchant creature you control

Enchanted creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost." (You may cast that card from your graveyard for its flashback cost. Then exile it.)

Set Avatar: The Last Airbender Eternal

Rarity Rare

Mana Value 2

Artist Tubaki Halsame

Collector # 121

Scryfall