I was wondering if someone could clarify this for me, if this is the wrong place to post this question I apologize….When playing the Grand Exchange gc, you swap ability cards with your opponent. Do you swap ALL ability cards? ie: all the ones in the used pile, and ones that are in play? Or do you only swap what is in you and your opponents unused pile?Additionally, does this swap happen BEFORE your opponent is allowed to play any ability cards? I know some ability cards state "play at the begining of a battle..." so which is the first step? Do you always play out the gc instructions before any ac's are used?