Necropotence is a rare Enchantment card from Pro Tour Collector Set (PTC), collector number ll154. Current market price: $24.49, TCGplayer market prices via Scryfall.
Skip your draw step. Whenever you discard a card, exile that card from your graveyard. Pay 1 life: Exile the top card of your library face down. Put that card into your hand at the beginning of your next end step.