Ehther, the Heavenly Monarch

Flash
Sovereign — (You may sacrifice a creature as an additional cost to cast this spell, if you do this card gains it's sovereign ability) When this card enters the battlefield send 2 noncreature permanents from your library to the Graveyard, then place 1 4-5 mana cost Noble from your deck to your field but it returns to the hand at the end of this turn.

When this card enters the battlefield you become the monarch