Berg Strider is a common Snow Creature — Giant Wizard card from Kaldheim (KHM), collector number 47. Current market price: $0.26 (foil $0.18), TCGplayer market prices via Scryfall.
When this creature enters, tap target artifact or creature an opponent controls. If {S} was spent to cast this spell, that permanent doesn't untap during its controller's next untap step. ({S} is mana from a snow source.)