Magestic Growth

Search your library for a basic land card and put that card onto the battlefield tapped, then shuffle your library. Create an enchantment aura token with "Enchant land" and "Whenever enchanted land becomes tapped, add {g} to your mana pool, and you gain an amount of life equal to the amount or opponents you have." and attach it to that land.
"When you find the land of the colors, life will have no end."