Bloodline Keeper  ^Flip is too slow and sort of a chance, you probably can't flip it often enough. I don't feel like Maga, Traitor to Mortals helps much. Noxious Ghoul is awesome but can hurt Kalitas, I'd not run it but don't fault you if you keep it. Holdout Settlement seems out of place, I don't get why you'd want it in a mono color deck instead of another swamp. I don't feel like Curse of Shallow Graves has enough value to run. Ashes to Ashes should go, you have enough targeted removal and if it has indestructible you can get them to sac it or you can hit it with -/- effects. Anowon, the Ruin Sage is awesome and I think you should put it in, Liliana's Reaver too. Overall I really like your build, I picked up a bunch of ideas from it for mine, thanks!

Notapoke Thanks for the feedback, and I'm glad it's given you some ideas!

I have yet to flip Bloodline Keeper  ^Flip, but I continue to live in hope! Speaking of, I have yet to do it but I have Noxious Ghoul on the list in hopes of performing a stepwise boardwipe with Kalitas out (Noxious enters, kills X/1, Kalitas makes a zombie to trigger Noxious, X/2s die, more zombies, rinse and repeat - hopefully with enough mana to spare to sac Noxious to Kalitas to keep the latter alive).

Holdout Settlement is a budget addition to provide coloured mana for casting spells taken with Praetor's Grasp or activating abilities of creatures stolen with Captivating Vampire (it's a low opportunity cost, but a high gain if you can nab something like a Beastmaster Ascension from a nearby elves deck!)

Happy to see another Commandalitas around!

(P.S. Maga, Traitor to Mortals completes the traitor trio with Kalitas and It That Betrays - traitor tribal hype!)