Shaman of Summer

{1}{g}, {t}: Create an Aura enchantment token
named Fertile Ground with "Enchant land" and "Whenever enchanted land is tapped for mana,
its controller adds an additional one mana of any
color" attached to target Forest you control.
When Shaman of Summer dies, sacrifice all
Auras attached to lands you control.
Unfailingly her presence doubles the season's yield.