Hailstorm Valkyrie

The entire threat is written into your deck list, not your hand. On rate the flying, trample body is negligible; every point of pressure comes from a pump that demands snow mana, and demands it two symbols at a time. That makes this a payoff that rewards commitment rather than card investment, and the deepest commitment is also the cheapest to make: a deck willing to swap its basics for snow-covered ones pays the price up front, at deckbuilding, without straining its colors. From there the sink grows on demand, sizing up in response to a blocker or mid-swing, as high as the snow-source count allows. Black rarely buys evasion this way. The color usually pays for its flyers with a resource it spends during the game (life, sacrifice fodder, a discarded card), not with a quiet decision made before the first turn. Here the snow requirement works the way a color-intensity restriction does elsewhere: it does not gate when you can act, only how deeply you had to commit before the game started. The trample earns its place for the same reason, since a creature this small only threatens real damage once it has grown large, and by then it wants a lane past chump blockers. Everything points back to one number decided before a card is drawn: how much snow you were willing to run.