Hello i have got in-fight bug which is similar to a bug while mixing decks, except that in fight it could be deadly:
You know when you are changing your deck (adding or removing cards), some cards have to move. But if you do it too fast and dont wait for cards to move, some cards could change them into another neighboring cards, which result in cat being duplicied. When you leave deck, and manage it again, everything is fine.
Problem is, that the same thing can happen in battle. I had nova on bottom. uped bone shield on top, and some pillars between it. I used pillars too quickly, and when my nova finally got to top, just under the bone wall, it changed into bone wall too. So i couldnt use it because i did not have enought quantums for bone wall.
In turn where i had enought quantums to summon bones wall, i did so. But i clicked the second wall (the one made from nova) and what happened? It took me quantums just like i would cast bone shield, but on my shield spot, nova appeared! it gave me no quantums and i dont know if it had some special effects except loosing a card and quantums. I just think that if some cards would be weirdly combined like this, it could be serious problem.
Here is screenshot to prove what happened:
http://img237.imageshack.us/img237/1965/novashield.jpg 
