Necropotence is a mythic Enchantment card from Eternal Masters (EMA), collector number 98. Current market price: $34.59 (foil $52.28), 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.