Lingering Souls is a uncommon Sorcery card from Dark Ascension (DKA), collector number 12. Current market price: $0.21 (foil $1.52), 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.)