Wow, I think I was one of the elemental opponents in your game. I don't pay for the extra hero choices, so I went with Rakanishu to buff a Molten Rock. Imagine my surprise when I fought the other two players that had the same cards. I tried to upgrade the tavern early to get the rest of the elementals early, but to your point EVERYONE managed to gold their boards. I've had the same experience when I was the only mech player in the game and playing into round 14 and upgrade to tier 5 still had not seen Mechano-egg, Replicating Menace, or Annoy-o-module.