Longleaf School of the Arts

If Longleaf School of the Arts would enter the battlefield, you may sacrifice a land. If you do, put Longleaf School of the Arts onto the battlefield. If you don't, put it into its owner's graveyard.
{t}: Add {w} or {g} to your mana pool.
{1}{w}{g}, {t}: Create a 1/1 green Squirrel creature token with flying.