Conflagrate is a uncommon Sorcery card from Ultimate Masters (UMA), collector number 126. Current market price: $0.28 (foil $0.41), 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.)