Utopia Sprawl

Ramp that costs you nothing in tempo after the turn you cast it: enchant a Forest with a single green pip on turn one, and from then on that land taps for its usual green plus an extra mana of the color you named, forever. Where most acceleration spends a permanent or a body to net a mana, this folds the bonus into a land you were already going to tap, so the ramp stays invisible to the rest of your sequencing. The color choice is the quiet leverage: you pick the splash you want when the Aura resolves, turning a basic Forest into off-color fixing as well as a turn-two two-drop into a three-drop. The cost is structural rather than situational. It demands a Forest, which means a green base or at least a green-heavy build, and it is a two-for-one waiting to happen, since any answer to the land carries the Sprawl with it. That fragility is the price the design pays for the rate: a one-mana enchantment producing a free extra mana from turn two onward would be oppressive if it lived anywhere the opponent could not attack by removing the manabase itself. It belongs to the same lineage of land-targeting accelerants as Wild Growth, but the chosen-color clause is what makes it a deckbuilding tool rather than a pure ramp spell.