Frostwalla is a common Snow Creature — Lizard card from Modern Horizons (MH1), collector number 165. Current market price: $0.10 (foil $0.37), TCGplayer market prices via Scryfall.
{S}: This creature gets +2/+2 until end of turn. Activate only once each turn. ({S} can be paid with one mana from a snow source.)