Past in Flames is a mythic Sorcery card from The List (PLST), collector number MM3-105. Current market price: $2.62, TCGplayer market prices via Scryfall.
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.)