Wow, this is easily one of the best free games I have seen.
However, I seem to have hit a wall after finishing all the quests though. Level 3 AI seems easy (80% win), but level 4 seems like an incredible jump in difficulty (5% win), I have not even bothered trying level 5. PvP 1 seems pretty much 50% win chance, and the opponent will most of the time drop in to AI control.
The only next step seems to be that I have to grind level 3 AI for hundreds (perhaps thousands) of matches (using almost the same deck) in order to get enough gold to upgrade and attempt level 4 or 5 AI. This is where the game suddenly plummets from amazing fun to zero fun.
You could claim I simply have an awful deck, but I have read up on the Wiki on numerous builds, and surely something that crushes level 3 decks in 60 seconds should stand a reasonable chance at the next level?
The rewards system seems a bit off, you can only win upgraded cards off beating a level 5, but it seems you need a mostly upgraded deck to attempt level 5 in the first place, thus you are winning things you don't really need.
Am I just missing something here, or is this how the game is meant to be?