Shimmerdrift Vale

Strip the supertype and this is fixing that has been printed a dozen times over: it enters tapped, commits to a single color as it enters, taps for that color forever after, the same job the Vivid lands did years earlier with a charge-counter budget bolted on. Its one distinction hides in a word most lands never carry. It arrives as a snow permanent, and every mana it makes is snow mana. That fact is invisible to the overwhelming majority of decks and structural for a narrow slice: any card that tallies snow permanents on the battlefield, or that demands snow mana to pay an activation cost, reads this as off-color fixing that still satisfies the snow requirement a basic snow land could not stretch to cover. What you surrender for that reach is decision speed on two fronts: it produces nothing the turn it lands, and it locks in a single color the instant it enters rather than letting you choose fresh each turn. It is a plain design whose entire claim rests on letting a snow-matters deck reach outside its base color without diluting the mechanic those decks are built around, which most nonbasic fixing simply does not bother to do.