Grim Draugr

The teaching common of a snow-matters theme, built to make the mechanic legible without a rules primer. The body is a plain 3/2, but the activated ability is where snow does its structural work: paying to grant +1/+0 and menace until end of turn turns the mana base itself into a combat resource. That is the quiet trick of snow as a cost here. You are not spending a special counter or a card, you are cashing in the snow-covered lands already in play, which means the activation costs nothing extra to include and rewards how deeply you have committed to snow sources. The pump is modest and menace on a beater is old news; nothing about the effect is new. What makes it work as design is that the payoff is tethered to a resource you were already investing in, so the deeper you build toward snow, the more reliably this closes a race. Repeatable, unconditional, and legible: activate it once and a new player understands what "snow synergy" is supposed to feel like. It is the load-bearing common of a mechanic whose whole appeal depends on players seeing the point of running snow lands, and one clean activation is all it takes to sell them on it.