This is a really fun game, but it feels so unfinished. The out-of-battle UI is cluttered and useless. Why do I have to go to the "browser" to read my cards, then -back to the- "deck builder" to put them in my deck? Why do I stare at a huge table full of 50 cards when I could just as easily be looking at stacks of each card in my deck? Way too frustrating. Battles are good though.
Gold is far, far too important. Frankly, if you don't have at least two gold mines in your opening hand, you should instantly surrender. It's still possible to win, but you'll win much faster if you keep restarting until you get a decent hand. Maybe there are some absurd legendary cards out there, but with what i have available, gold mine is the best card in the deck by far. It's the best card to have in your opening hand, the best card to draw halfway through the game, and the best card to draw late in the game. In other words, this is not exactly balanced.
It would be nice if cards of the same type simply stacked when your building decks. That would make it a lot easier to see all of what you have, especially since they sort buttons don't seem to sort them very well.
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