My group and I have been playtesting a new format. Here is a summary of The Soulless Format:

The Soulless Format was designed specifically to satisfy four criteria. First, to satisfy our desire to be able to use Planeswalkers as commanders. Second, because the most powerful rares were dominating our format; we wanted to encourage using cards that hardly ever get any love. Third, to fix the "mana screw" problem. Last, to be the ultimate EDH deck building challenge. It is best summarized as an amalgam of the EDH, Pauper, and Rainbow Stairwell formats.

If it sounds interesting, feel free to check it out. The link to the blog containing all of the details, deckbuilding rules, etc can be found here: http://mtgsoullessformat.blogspot.com/

Let me know if you have any questions. If your group chooses to give it a try, I'd love to know what you think!