Ok, my first thoughts are the following.
I would not play
Omniscience, but rather 1
Prise de guerre, as defence is not what you seek (Other than
Avatar de Sol'Ra, your characters will take 4 damages at the end of each odd turn, which makes them prone to 1HKO, especially on turn 2.)
You play a lot on spirit too, so why don't you add
La porte du désert?
Both cards chain and are unguilded, what more could you ask for?
Having 3
Sécheresse in your deck makes it harder to use
Deus ex machina. I would take one sample of both out (especially if you added the afore mentioned cards).
Fresque d'Aksenoun is... well, not so good. Leave them out of your deck. Especially when you play
Netjhim, who gets cards back from the discard pile.
Last, you should evolve
Exhorter la foi to
Lumière divine and your
Netjhim to his final level. I do not fully understand why you would play AoE healing spells when your characters (apart from Avatar) are prone to die fast (but do as you please).
Other than that, it is overall fine. Very likely to subdue mages.
I would also play
Retour à Noz'Dingard or
Bottes des cieux to use Avatar to its fullest potential, but it would make
Deus ex machina harder to play because neither chains.
