Spirit Flare is a common Instant card from Torment (TOR), collector number 15. Current market price: $0.10 (foil $0.61), TCGplayer market prices via Scryfall.
Tap target untapped creature you control. If you do, it deals damage equal to its power to target attacking or blocking creature an opponent controls. Flashback—{1}{W}, Pay 3 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)