Vrien, Tundra Cascade

Vigilance
When Vrien, Tundra Cascade enters the battlefield, for each opponent, tap up to one target nonland permanent each of those players control. Those permanents don't untap during their controller's next untap step. If you control at least four nonland snow permanents, instead tap up to three target nonland permanents each of those players control and those players skip
their next untap step.