Necropotence is a mythic Enchantment card from From the Vault: Exiled (V09), collector number 9. Current market price: — (foil $58.43), 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.