Doors to the Far Lands

When Doors to the Far Lands enters the
battlefield exile one target basic land that each
player controls. If you can't, sacrifice Doors to
the Far Lands
{t}: Add one mana of each color that lands exiled
with Doors to the Far Lands would produce.
{x}, {t}: Return target card you own from exile
to your hand with converted mana cost X or less.