As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.
You canâ€™t tap Winter Orb just because you want to. Another ability, such as that of Glare of Subdual, must instruct or allow you to do so.
All permanents untap during a playerâ€™s untap step at once. If Winter Orb is tapped as your untap step begins, your lands will all untap.
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