http://forums.mtgsalvation.com/showthread.php?t=317328Legacy EDHLegacy EDH is an attempt to create a competitive 1V1 Commander format.
It using the Legacy banned list, it cuts out a lot of degenerate combo and mana acceleration cards. Note that in Shambling Strider's banned list, a few extra cards, such as Karakas, Rofellos, and Clique are also banned.
By switching to 20 life it opens up aggro as a viable archetype.
I think, if there was to be any form of competitive EDH format, this would be the one.