[EDH] Church of Sciontology

As I'm quite new to EDH, I'd love some feedback on my new deck, Church of Sciontology with, believe it or not, Scion of the Ur-Dragon as my Commander.

The whole deck rotates around getting Dragons out on the battlefield cheap using Kaalia of the Vast , Imperial Hellkite , etc. Using Scion of the Ur-Dragon , I can get the Dragons into my graveyard, making Bladewing the Risen awesome. I can combine him with Deadeye Navigator to revive several Dragons every turn, unless my playgroup is okay with making infinite mana with Deadeye Navigator and Peregrine Drake . I'm also focusing on equipping Basilisk Collar onto Niv-Mizzet, the Firemind for devastating pings. Add Consecrated Sphinx for extra fun.