Efmos, Fallen King

{b/g}{g/u}{u/r}{r/w}{w/b}: Destroy all nonland,
non-Fallen cards on the battlefield; Sacrifice
Efmos, Fallen King. Activate this effect only
as a sorcery.
When Efmos, Fallen King is sent
to the graveyard, return a Fallen Dragon
card from your graveyard to the battlefield
other than Efmos, Fallen King.