Briarhorn is a uncommon Creature — Elemental card from Duel Decks: Nissa vs. Ob Nixilis (DDR), collector number 3. Current market price: $0.20, TCGplayer market prices via Scryfall.
Flash When this creature enters, target creature gets +3/+3 until end of turn. Evoke {1}{G} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)