Korvex, Titan of Tidal Tempest

When Korvex enters the battlefield, sacrifice it
unless it escaped.
Whenever Korvex enters the battlefield or attacks,
return target creature to its owner's hand. Korvex
deals 2 damage to any target.
Escape—{u}{u}{r}{r}, exile five other cards from
your graveyard. (You may cast this card from your
graveyard for its escape cost.)