Nightmare Void is a uncommon Sorcery card from Duel Decks: Izzet vs. Golgari (DDJ), collector number 73. Current market price: $0.09, TCGplayer market prices via Scryfall.
Target player reveals their hand. You choose a card from it. That player discards that card. Dredge 2 (If you would draw a card, you may mill two cards instead. If you do, return this card from your graveyard to your hand.)