Strangling Soot is a common Instant card from Duel Decks: Sorin vs. Tibalt (DDK), collector number 65. Current market price: $0.40, TCGplayer market prices via Scryfall.
Destroy target creature with toughness 3 or less. Flashback {5}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)