Conflagrate is a uncommon Sorcery card from Time Spiral (TSP), collector number 151. Current market price: $0.27 (foil $2.55), TCGplayer market prices via Scryfall.
Conflagrate deals X damage divided as you choose among any number of targets. Flashback—{R}{R}, Discard X cards. (You may cast this card from your graveyard for its flashback cost. Then exile it.)