The Weirwood Tree

The World Tree enters the battlefield tapped.
{t}: Add {g}.

As long as you control six or more lands, lands you control have "{t}: Add one mana of any color."

{w}{w}{u}{u}{b}{b}{r}{r}{g}{g}, {t}, Sacrifice The World
Tree: Search your library for any number of God
cards, put them onto the battlefield, then shuffle.