Chillerpillar
{3}{U}
Snow Creature -- Insect
3/3
{4}{S}{S}: Monstrosity 2. (If ~this~ 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~ is monstrous, it has flying.