I don't have an answer to your question. I was pleasantly surprised someone in the states got it. Did it just come or did you order previously from a retailer in Europe?
Only have Atlantean expansion right now. It came with it's Variant for the AI and it's noted in the rule sheet. 2 cards for the single player variant (1 Attack card and 1 Virtual player faction card)
There wasn't anything like that in the Aztec rule sheet I found online.
Just wondering why that is as all of the factions to date have their cards except the Aztec faction.