Chillerpillar is a common Snow Creature — Insect card from Modern Horizons (MH1), collector number 43. Current market price: $0.15 (foil $0.22), TCGplayer market prices via Scryfall.
{4}{S}{S}: Monstrosity 2. (If this creature isn't monstrous, put two +1/+1 counters on it and it becomes monstrous. {S} can be paid with one mana from a snow source.) As long as this creature is monstrous, it has flying.