Personally I would add Singdragosa to the deck. Combining her with Frost lich jaina gives you so much value. Pinging 0/1 and getting a radon legendary and getting a 3/6 with freeze and lifesteal is just so valuable.
Everyone compares this to Yesara but one thing people don't think about is that with Yesara you either have to pull it or craft it. Nefarian all you got to do is unlock Blackrock and win. I believe this one is better just because it's more easily accessible.