I strongly deny all that, I have no need to have help with the giants due to my other allies and that kind of spy operation against Ulm and the giants would be horrendously expensive, costing somewhere in the 30 g range for something that is extremely likely to fail. I was going to pay the emperor but I saw how well he was doing on his own and I had more important things to spend my money on then an npc at the other side of my large neighbor. Mictlan is also really far away from me and that was near the beginning of the game, I was more worried about building an army and taking territory than annoying a player who is far away, the cost of any spy thingy that far away would be horrendous for an early game economy and wouldn't have any real benefits that out way the risk of getting caught.
If I were to do sneaky things it'd be against you or T_F because you two are the only threats to me, not Ulm or Mictlan.