Rem Karolus, Stalwart Slayer is a rare Legendary Creature — Human Knight card from Innistrad: Midnight Hunt (MID), collector number 322. Current market price: $0.33 (foil $0.45), TCGplayer market prices via Scryfall.
Flying, haste If a spell would deal damage to you or another permanent you control, prevent that damage. If a spell would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus 1 instead.