Glittering Frost

The line of ramp Auras runs back through Wild Growth and Fertile Ground, and this sits at the color-fixing end of that lineage: attach it to any land and each tap yields an extra mana of any color. That flexibility is the pitch, but the design pays for it in fragility. Because it is an Aura rather than a creature, it produces immediately if you enchant an untapped land, so there is no summoning-sickness lag; the tax is that you have spent three mana to stitch your acceleration to a single permanent that dies to land destruction or an enchantment sweeper, and land destruction takes two mana sources with it. Weighed against a mana dork, the trade is a body-for-flexibility swap: no attacker or blocker, but any-color output the moment it lands. The snow rider is the quiet second job. Turning the enchanted land into a snow permanent feeds the snow-matters payoffs it shares a design space with, so the Aura can double as a snow-count enabler in a deck that wants the supertype rather than pure ramp. On its own the acceleration-plus-fixing math is straightforward and a touch brittle; the snow supertype is what gives it a reason to exist over the older, safer growth Auras it descends from.