Rimehorn Aurochs is a uncommon Snow Creature — Aurochs card from Coldsnap (CSP), collector number 118. Current market price: $0.15 (foil $2.60), TCGplayer market prices via Scryfall.
Trample Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking Aurochs. {2}{S}: Target creature blocks target creature this turn if able. ({S} can be paid with one mana from a snow source.)