I use Pax more for the early game board presence they provide as Sajj needs a bit of breathing room to get the artifact combos going and having too much healing packed into 2 drops tends to result in wasted healing.
The Nosh-raks are there to make the totems a much bigger threat, Noshy essentially cuts the kill clock in half. Not to mention this deck has a few fat bodies, so them having removal for Nosh-rak, Incinera AND Aymara is unlikely. Noshy himself is a finisher in a sense.



