Berg Strider

The enters-the-battlefield ability can target an artifact or creature an opponent controls that’s already tapped. If snow mana was spent to cast Berg Strider, the target won’t untap during its controller’s next untap step.

Similarly, if an effect copies the creature spell that becomes Berg Strider, no mana was spent to cast the copy. The target won’t be stopped from untapping during its controller’s next untap step.

If Berg Strider enters the battlefield without being cast, no mana was spent to cast it. The enters-the-battlefield ability may still tap the target, but that permanent won’t be stopped from untapping during its controller’s next untap step.