Nylea's Presence

Fixing rarely gets to replace itself, but this one does, stapling a cantrip to an effect that quietly rewrites a land's identity rather than its mana ability. Turning the enchanted land into every basic type is a strictly broader trick than tapping it for an extra color: it feeds anything that reads land subtypes on the battlefield, from abilities that punish or reward basics to subtype-matters synergies that want a land to claim every type at once. The card you spend is recovered immediately by the draw, so the Aura is card-neutral fixing rather than a real card disadvantage, even if you still lay out the two mana up front with nothing untapping to show for it. The design lives in the gap between a Rampant Growth that thins your library and a fixing land that enters tapped: this commits to a land you already control, dodges the fragility of a creature-based mana source that dies to removal, and replaces itself the moment it resolves. The cost is the Aura's own fragility, since destroying or bouncing the enchanted land takes the fixing with it, and the cantrip fires only once. As green color-fixing it sits in a small family that pays for its flexibility up front rather than tucking the disadvantage into a downside clause, which is what keeps it from ever feeling like a tax even when the fixing it provides turns out to be marginal.