Moan of the Unhallowed is a uncommon Sorcery card from Duel Decks: Blessed vs. Cursed (DDQ), collector number 62. Current market price: $0.06, 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.)