I just beat the game couple days ago. I quit play the card after trying to beat the CC (or GG) group. After that there were to many difficult rules. But one thing is the rule making me more confuse. Plus? Same Wall? I forgot the others. But same and plus are the one that I always encountered after Galbadia Garden I guess. The plus one that makes me want to quit. I don't understand about plus rule. Somehow the enemy can do it. When they got plus they got combo when they got combo I lose, most of the time. I never got Combo or anything just Same. Maybe later in my second playthrough I'll try finish it again, try to acquire the rare cards.

Yeah the rare card really hard to get. It takes forever to wait that person to play with rare card.