Frigos, Titan of Winter's Woe

When Frigos, Titan of Winter's Woe, enters the battlefield, sacrifice it unless it escaped.
Whenever Frigos enters the battlefield or attacks,
you may discard a card. If you do, tap up to X
creatures your opponents control where X is the
discarded card's converted mana cost.
Escape —{u}{u}{r}{r}, Exile five other cards from
your graveyard. (You may cast this card from your
graveyard for its escape cost.)