So I'm really proud of this one.

This deck works better in a larger commander game.  It's slow to start but tops out higher than anything else I've seen out there.  The idea is to put as many cards into your graveyard as possible and use Karador (the commander) to pick and choose what you need at any given moment.  Discard big creatures to power spellshapers and mill as often as you can with Dredge, the Hermit Druid, the Altar, and whatever else comes up.  Once you get all three colors of mana, you should not draw but dredge full time if you can.  Groundskeeper and Life From the Loam will fetch what mana you need.

I recommend you seek out Reya or Sheoldred for early revival so they can power your graveyard for free - if you get an early Entomb, Buried Alive, or Corpse Conoisseur, that's what you should find.  Then shift as your needs demand.  Fighting a creature deck?  Use Novablast Wurm or Blazing Archon to shut it down.  Having trouble from creature destruction?  Use Avacyn or the Reaper to end that in a hurry, or use Glory's ability to parry whatever comes your way.  Is your opponent a spellcaster?  Use Platinum Empirion to end the threat then turn your attention to breaking his defenses with the Eldrazi, or starve him out with Vorinclex.

Specific card tips:  Cast Karmic Guide from the graveyard with Karador's ability, to get a big scary monster from the grave, then let her echo kill her.  Wash, rinse, repeat.  Evoke Shriekmaw with Karador for a renewable Terror.  Play Novablast Wurm followed by Avacyn, then attack, to wipe out your opponent's army without touching your own.  Necrotic Ooze is a versatile card with plenty of spellshapers in the grave (or Avatar of Woe).  Use Dawnstrider's ability to keep attackers at bay or the Avatar's ability to kill the big creature.  Cast Eternal Witness with Karador, then sacrifice it to an ability to reuse Entomb or Buried Alive.  Dredge instead of Draw with Griselbrand to get a ton of cards into the grave in a hurry.  Fauna Shaman and Undertaker can swap the big cards you can't cast for ramp creatures like the Myr to get Karador out faster.

EDIT: Griselbrand and Recurring Nightmare are EDH-banned now, so I have replaced them with Iona, Shield of Emeria and Manabond, respectively.  I'm a little disappointed, but there we are.