Bloodsky Berserker is a uncommon Creature — Human Berserker card from Kaldheim (KHM), collector number 80. Current market price: $0.22 (foil $0.37), TCGplayer market prices via Scryfall.
Whenever you cast your second spell each turn, put two +1/+1 counters on this creature. It gains menace until end of turn. (It can't be blocked except by two or more creatures.)