Varwyld, Winters Chosen

Hexproof, Vigilance
Whenever Varwyld, Winters Chosen enters the
battlefield or attacks, tap or untap target artifact
or creature and you gain 2 life.
{t}, put Varwyld into your library third from the
top: Tapped permanents your opponents control
don't untap during their next untap step.
And the curtain of winter falls.