The Cauldron

The World Tree enters the battlefield {t} Tapped.{t}Tap: Add {g}
As long as you control six or more lands, lands you control have{t} "Tap: 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.