Tree of Worlds

Tree of World enters the battlefield tapped.
{t}Add {w},{u},{b},{r},or{g} long as you control six
or more lands,
{t}:Add {g}
{t}{w}{w}{u}{u}{b}{b}{r}{r}{g}{g}sacrifice Tree of World
search your library for any number of legendary creature cards put them onto the battlefield, then shuffle your library.