The Archmage difficulty should block goblin saboteurs as a priority, as well as not try to kill phoenix that is going to regen when it can kill something else.
It's a great card game in my opinion. So far, the only problem I have with it is the abruptness of the music loop. The first few times I heard it, I thought something was going wrong with the computer. It's good music, it just isn't looping in the best way.
The elite+ versions of the 2nd classes should be made stronger so that they are actually available as strategic options in end game. For example, a Divine Berserker is extremely weak compared to a Mercenary or Assassin of the same level, and a Knight who continues on the path should get some other advantage that a Grey Knight doesn't have, etc. Making those classes balance out in the end would lead to richer build options.
Chaos Desert does need to be nerfed. Being able to drain the opponent's special so easily and early in the match is ridiculous; not to mention that Chaos Desert does the highest damage in the game with their burn XD.
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 "Accelerator"){kind=icon}
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 "Wings of Genesis"){kind=icon}
 "Book of Mages: The Dark Times"){kind=icon}
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the next update is about to come. the all small problem will not be there.