Briarhorn is a uncommon Creature — Elemental card from Planechase (HOP), collector number 69. Current market price: $0.30, 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.)