Lingering Souls is a uncommon Sorcery card from Tarkir: Dragonstorm Commander (TDC), collector number 123. Current market price: $0.32, TCGplayer market prices via Scryfall.
Create two 1/1 white Spirit creature tokens with flying. Flashback {1}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)