Orim's Cure is a common Instant card from Mercadian Masques (MMQ), collector number 33. Current market price: $0.19 (foil $0.63), TCGplayer market prices via Scryfall.
If you control a Plains, you may tap an untapped creature you control rather than pay this spell's mana cost. Prevent the next 4 damage that would be dealt to any target this turn.