Emberhorn Minotaur is a common Creature — Minotaur Warrior card from Amonkhet (AKH), collector number 130. Current market price: $0.12 (foil $0.23), TCGplayer market prices via Scryfall.
You may exert this creature as it attacks. When you do, it gets +1/+1 and gains menace until end of turn. (An exerted creature won't untap during your next untap step. A creature with menace can't be blocked except by two or more creatures.)