So, if you activate your lands to add the mana to your pool, THEN activate the loyalty ability from the planeswalker to untap all the enchanted permanents you control, and some of these enchanted permanents happen to be lands, sure, you can tap them again to add their mana to your pool once more
(2016-06-08) Balance doesn't have targets, so permanents that can't be targeted, such as a creature with shroud or protection from white, are valid choices to be sacrificed
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