Growing Gardens

As Growing Gardens enters the battlefield, you
may exile a creature you control with converted
mana cost 2 or less. If you don't, Growing
Gardens enters the battlefield tapped.
{t}: Add {w} or {g}.
{1}{w}{g}, {t}: Create a token that's a copy of the
creature card exiled by Growing Gardens. If you
control three or more creature tokens, sacrifice
Growing Gardens.