As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.
"How could anyone survive this? There is some force at work that stifles even the will to go on."
—Naromin, veteran explorer
Collector Number: 234
2016-06-08 All permanents untap during a player's untap step at once. If Winter Orb is tapped as your untap step begins, your lands will all untap.
2016-06-08 You can'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.
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Orbe de l'hiver