Conifer Wurm

The snow-matters mechanic gives designers a way to gate a payoff behind a deckbuilding tax paid before the game starts: to pump this Wurm meaningfully, you have to fill your mana base and permanent slate with snow-typed cards rather than their ordinary counterparts. The body starts as a plain 4/4, but the activated ability scales with every snow permanent you control, so its ceiling is a function of how committed you were to snow long before you drew it. That is the tension the card resolves: green already has efficient beaters, so this one asks you to trade some consistency (snow-covered lands, snow artifacts, snow enchantments) for a mana sink that grows with your board instead of staying fixed. Trample is what turns the scaling from large into lethal, since a snow-heavy player can dump mana into a single attacker and count on most of the damage carrying through a chump blocker. Green has a long history of creatures built around a repeatable "grow" ability, but the cost here is unusual: it is not paid on the card itself, it is the entire shape of your permanent count, decided at deckbuilding rather than at the moment of activation. The pump math rewards a wide, all-snow board and punishes a splashed one, which makes the Wurm less a threat you cast than a verdict on how seriously you took the snow theme.