The Boiling Isles

The Boiling Isles enters the battlefield tapped.
The Boiling Isles doesn't untap unless you control
a Plains, Island, Swamp, Mountain and Forest.
{t}: Add one mana of any colour.
{t}, {w}{u}{b}{r}{g}: exile a card from your Hand or
from the top of your Library. Until end of turn,
you may play it without paying its mana cost,
and you may play an additional land this turn
if it was exiled with this ability.