Nivix Barrier is a common Creature — Illusion Wall card from Magic Origins (ORI), collector number 66. Current market price: $0.05 (foil $0.49), TCGplayer market prices via Scryfall.
Flash (You may cast this spell any time you could cast an instant.) Defender (This creature can't attack.) When this creature enters, target attacking creature gets -4/-0 until end of turn.