Warfire Javelineer is a uncommon Creature — Minotaur Warrior card from Amonkhet (AKH), collector number 155. Current market price: $0.04 (foil $0.40), TCGplayer market prices via Scryfall.
When this creature enters, it deals X damage to target creature an opponent controls, where X is the number of instant and sorcery cards in your graveyard.