Berg Strider is a common Snow Creature — Giant Wizard card from The List (PLST), collector number KHM-47. Current market price: $0.24, 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.)