Do'Sail of the Two Realms

Flying, protection from black
Echo {3}{w}{w} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When Do'Sail of the Two Realms enters the battlefield, return target creature card from your graveyard to the battlefield.
He does Bahamut's bidding in this world, and when called returns to his sacred realm.