On Thin Ice

The trick here is a taxation the removal spell doesn't announce. Priced at a single white mana, it functions as one of the cheapest unconditional creature-answers in the color, and the payment for that rate is folded into a deckbuilding demand rather than the mana line: the Aura can only enchant a snow land you control, so the whole plan collapses unless you've committed to snow-covered basics from the start. That constraint is the entire balancing act. Support the theme and one white mana buys an Oblivion Ring on a creature; ignore it and you have an uncastable card. The exile itself is not instantaneous. It arrives as an enters-the-battlefield trigger that goes on the stack once the Aura resolves, which leaves a narrow window an opponent can respond in before the creature is gone. And like every exile-until-leaves effect, the answer is only as durable as the enchantment: destroy or bounce the Aura and the creature returns, so the reversibility is the honest price of stapling premium removal to a single pip. The requirement's elegance is that it's binary. You need exactly one snow land, no more, so the whole cost is a yes-or-no question about your manabase rather than a sliding tax. It's the kind of card that gives the snow tag a reason to exist beyond flavor.