Skalf, Titan of Frost's Calm

When Skalf enters the battlefield, sacrifice it unless it escaped.

Whenever Skalf enters the battlefield or attacks, put
a stun counter on up to 1 target creature an
opponent controls, then scry 2.

Escape—{w}{w}{u}{u}, Exile 5 other cards from your graveyard. (You may cast this card from your
graveyard for it's escape cost.)