Shimmerwilds Growth

Utopia Sprawl solved this problem for one specific mana base: your Forest, tapped for green. This widens the target and asks a different question about what you want from the acceleration. Any land takes the Aura, and the color-choice clause changes the land's color while adding a triggered ability that produces one extra mana of that color whenever the land is tapped for mana. The land keeps everything it already did: a dual still makes both its colors, a fetchable still fixes, an Island still taps for blue. The Aura simply stacks a bonus mana of your chosen color on top of that output. That is the lineage worth tracing, since green has a long history of enchanting a land to double its yield, and the twist here is aiming that doubling at any land you control rather than the basic you were always going to play. The two-mana cost is what separates it from Sprawl's one: this is a turn-two setup at best, and if the enchanted source is untapped when the Aura resolves, the payoff can arrive that same turn, when it taps for its native mana plus the extra. The color you name is a commitment to what the ramp produces, not a constraint on what the land can do, so the practical use is pointing a source you already run toward a single color you want more of. It reads like fixing and functions like acceleration, which is the honest way to describe a green ramp piece that adds rather than fixes.