Emberhorn Minotaur is a common Creature — Minotaur Warrior card from Foundations Jumpstart (J25), collector number 540. Current market price: $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.)