Misty Palms Oasis

Misty Palms Oasis enters the battlefield tapped.
When Misty palms Oasis enters the battlefield, sacrifice it unless you pay {1}.
{t}: Add one many of any color to your mana
pool.
{3}, {t}: Add X mana of any number of colors to
your mana pool where X is the number of
legendary permanents you control.