Dragonkin Berserker is a rare Creature — Human Berserker card from Kaldheim (KHM), collector number 357. Current market price: $0.34 (foil $0.64), TCGplayer market prices via Scryfall.
First strike Boast abilities you activate cost {1} less to activate for each Dragon you control. Boast — {4}{R}: Create a 5/5 red Dragon creature token with flying. (Activate only if this creature attacked this turn and only once each turn.)