A potentially great game, but it's fatally flawed.
I really want to love this game. Unfortunately, I can't bring myself to do so because it is too frustrating to play. Why? Because the game is not balanced at all (and, honestly, it seems like the computer cheats).
The problem, as I see it, is the cards appear to be randomly doled out. There really is no "deck" that gets used up and reshuffled when playing a duel. This means that you (or, in my experience, more likely your enemy) can get lots of the same really high power cards, all possibly within a short span of time. Where is the fun when the enemy throws "Nasty Cut", "Regeneration", or "Dismemberment" multiple turns in a duel, or worse, in a row? That is seriously wrong. Those cards are incredibly powerful and should be limited to one per deck/duel.
My random-card-drawing-luck must be really bad because I get my butt handed to me almost every other duel and thus I can't seem to make it past the fricken' orange belt. It's really frustrating. Don't even get me started on the tournaments. My best so far is winning two of the six consecutive duels neeeded to succeed in a tournament. If the game were balanced maybe I'd have a chance in hell. As it stands, no way.
Also, the sheer number of cards makes many of them useless for most situations. There have been many times I have had the enemy on the ropes and I don't get any actual attack cards when (surprise surprise) he throws lots of heal or regeneration cards. Um ... is this a duel or are we just messing with our hazumi, offense and defense scores? I spend more time waiting for a useful card (or maybe even trying NOT to play one that will hurt me) than actually dueling. A discard option might be a good addition to help solve this problem. And no, waiting for a discard card is not a good solution.
Finally, I would like to point out there are still some bugs that ought to be fixed. For instance, when the enemy throws "discard 1 card", I don't get my used card replaced before my turn. When I drop the enemy defence to 0 for 1 turn, it does back to it's normal amount before I can attack, so that card is basically useless. Also, I think I have seen instances when swapping offense or defense scores didn't work right. I'm sure there are some other "math" bugs, but it's hard to keep track of all the attack/bleeding damage/regeneration going on so quickly.
All in all, this could be a really great game. I think it needs more play testing to even things out.
Oh, and if you plan to reply that you like and purposefully built the game this way, that's fine. I'll just stop trying and go play Maganic Wars instead. It's nicely balanced, IMHO.