Sejuani, Fury of the North

Flash, Vigilance, Trample, Haste
Whenever Sejuani, Fury of the North comes into play, tap all permanents you don't control. They do not untap during their controller's next untap step.
Whenever Sejuani, Fury of the North deals damage to a creature, tap that creature. It doesn't untap during its controller's next untap step.