Kokabiel, Angel of the Stars

{3}, Search your library for a creature card and exile it: Kokabiel, Angel of the Stars gains all activated abilities of that creature.
Whenever Kokabiel leaves the battlefield, return all cards exiled by it to the bottom of your deck.
At the beginning of your upkeep, you may sacrifice a creature. If you do, return Kokabiel from your graveyard or exile to your hand.