National Dagoba Arena

National Dagoba Arena enters the battlefield
tapped.
{t}: Add one mana of any color.
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 National
Dagoba Arena: Search your library for any
number of Student creature cards, put them on
the battlefield, then shuffle your library.