Merciless Javelineer is a uncommon Creature — Minotaur Warrior card from Amonkhet (AKH), collector number 202. Current market price: $0.17 (foil $0.69), TCGplayer market prices via Scryfall.
{2}, Discard a card: Put a -1/-1 counter on target creature. That creature can't block this turn.