Is Past in Flames legal in Standard, Modern, and Commander?

Past in Flames is legal in: Modern, Legacy, Vintage, Commander, Historic.

Past in Flames

Q: What type of card is Past in Flames?

Past in Flames is a Sorcery. Its oracle text reads: "Each instant and sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. Flashback {4}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)"