Ehther, the Heavenly Monarch

Flying, Vigilance
As an additional cost to cast this spell, Sacrifice a creature.
When Ehther, The Heavenly Monarch enters the Battlefield, choose one—
•Search your library for a Royal card and put that card into your graveyard, then shuffle your library.
•Search your library for a Royal creature card and put it onto the battlefield, it gains haste and "At the beginning of your next endstep, return this creature to its owner's hand", then shuffle your library.
Partner