Solitary Confinement is a rare Enchantment card from Judgment (JUD), collector number 24. Current market price: $8.16 (foil $119.99), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, sacrifice this enchantment unless you discard a card. Skip your draw step. You have shroud. (You can't be the target of spells or abilities.) Prevent all damage that would be dealt to you.