Necro-Impotence is a rare Enchantment card from Unhinged (UNH), collector number 60. Current market price: $2.77 (foil $60.60), TCGplayer market prices via Scryfall.
Skip your untap step. At the beginning of your upkeep, you may pay X life. If you do, untap X permanents. Pay ½ life: Exile the top card of your library face down. Put that card into your hand at the beginning of the next end step.