Moan of the Unhallowed is a uncommon Sorcery card from Innistrad (ISD), collector number 109. Current market price: $0.08 (foil $0.43), TCGplayer market prices via Scryfall.
Create two 2/2 black Zombie creature tokens. Flashback {5}{B}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)