MTG Wiki defines ramp as A card which accelerates your mana, giving you an additional, reusable mana source beyond the usual one land per turn
Treefolk dont see much play outside of Commander
But Last March of the Ents gives you a lot more than Storm the Festival for two more mana, so if you are in that space anyway
It is incorrect on at least the first run of the printed cards, and has now been corrected
Selvala, Heart of the Wilds Rolling card draw and mana dork in one card, Selvala, Heart of the Wilds makes for one of the best mono-green commanders and frequently shows up in cEDH decks under Sisay, Weatherlight Captains command
Abbot of Keral Keep helps us actually hit our four-drops on time despite playing just twenty lands