Talk:Battle/@comment-5605544-20130112153758/@comment-220.255.4.30-20130117025348

did a little experiment:

My guess is that the game now treats frontline and backline as 2 different pools of cards.

So lets say if you have 2 PM lush, it can appear as 1 in frontline and 1 in backline. But there cannot be 2 lush in the backline. This mean to say that in your battle formation, the maximum number of duplicate cards you can use is 5.