Ethir, Titan of Sea's Anger

When Ethir, Titan of Sea's Anger enters the battlefield, sacrifice it unless it escaped.
When Ethir, Titan of Sea's Anger enters the battlefield or attacks, you may return target
creature to its owner's hand, then draw a card.
Escape --{u}{u}{u}{u}, Exile six other cards from
your graveyard.
The ferocity of the sea itself.