Is Fire Nation Attacks legal in Standard, Modern, and Commander?

Fire Nation Attacks is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Fire Nation Attacks?

Fire Nation Attacks is an Instant. Its oracle text reads: "Create two 2/2 red Soldier creature tokens with firebending 1. (Whenever a creature with firebending 1 attacks, add {R}. This mana lasts until end of combat.) Flashback {8}{R} (You may may cast this card from your graveyard for its flashback cost. Then exile it.) *Everything changed.*"

Fire Nation Attacks

Instant

Create two 2/2 red Soldier creature tokens with firebending 1. (Whenever a creature with firebending 1 attacks, add . This mana lasts until end of combat.)

Flashback (You may may cast this card from your graveyard for its flashback cost. Then exile it.)