Solitary Confinement is a rare Enchantment card from Modern Horizons 2 (MH2), collector number 265. Current market price: $0.60 (foil $3.35), 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.