Necropotence is a mythic Enchantment card from Wilds of Eldraine: Enchanting Tales (WOT), collector number 74. Current market price: $41.13 (foil $127.38), 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.