Hevivo, the Druid King

Morph {2}{g}{g} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for it's morph cost.)
When Hevivo, the Druid King is turned face up, untap all lands you control.
Whenever you tap a land for mana, add one additional mana of any color that land produced to your mana pool.