New Horizons

Most green ramp is an ephemeral burst: a creature you can kill, a sorcery that cashes a card in for a single point of acceleration. This stakes its acceleration to a permanent type almost nothing wants to spend a removal spell on. Enchant a land and that land taps for two mana of any one color, which makes it both a ramp piece and color-fixing in a single slot: the kind of dual-purpose mana that mono-green strategies normally have to give something up to get. The +1/+1 counter on entry is what earns its keep the turn you cast it. A naked ramp Aura would do nothing on cast except advance your mana, but the counter pushes a creature forward immediately, so even with no use for the extra mana yet, you are still developing the board. That structure (a land-Aura that fixes and accelerates) puts it in the lineage of Utopia Sprawl and Fertile Ground, the green enchantments that turn one land into a multicolored source, but it leans further toward fixing by producing any single color rather than a fixed one. The trade-off is the one all land-Auras carry: destroy the land and the Aura dies with it, so you are stacking your mana base onto a single removable point. For decks that intend to play out ahead of the game rather than get blown out of it, that risk rarely comes due.