I recently noticed that the color of Mogwai’s armor and helmet greatly resembles that of the Vetruvian units. This and the fact that his ability (draw a card after he moves) rather fit the Vetruvians with their different ways toi draw more cards has made me wonder wether Mogwai is perhaps a former soldier from the Vetruvian imperium, or perhaps a mercenary who fought for them long enough to earn a sand shield of his own.
I originally noticed this while pondering which cards to disenchant so I could craft a few Starfire Scarabs. I still have my Mogwai and managed to get enough spirit by participating in the gaunlet and sacrificing some cards I didn’t need, but if the Codex ever reveals that he is a deserterfrom the Vetruvian imperium I will definetly use him to craft some Vetruvian cards, just because it would be incredibly ironic and most fitting. Of course, this is all speculation ^^