Prototype--Feedback needed

This is my first commander deck. It started out as a Jarad Commander but then I fell in love with Karador.

Main focus is to get creatures out that can be sacrificed Apprentice Necromancer Savra, Queen of the Golgari and also force opponents to sacrifice, ex. Abyssal Gatekeeper Butcher of Malakir Grave Pact. Therefore bypassing any hexproof and flying creatures and also building my creature pool to get Karador on the board quickly. Then I'll either win by making the opponents sacrifice all of their creatures or have my big creatures out that get power and toughness by creature graveyard total Boneyard Wurm .

Some might suggest tokens or creatures who make tokens. In commander though I feel like I wouldn't have enough in the allotted time for it to be of use for me. Plus tokens wouldn't help with my creature graveyard for Karador. I would rather find more creatures that I can bring back from the graveyard and reuse their "enters the battlefield, do certain action" ex. Sewer Nemesis Angel of Despair Corpse Connoisseur

Mostly I'm trying to get more eyes on this so people can tell me if there are better cards for what I'm trying to achieve. I wouldn't mind getting rid of the little white I have if there is a better green or black card.