my idea is to add something like card level/tier
if we could say there are 3 good cards, 3 ok cards and 3 bad cards for every merc we could do something like this:
lets say we are trading up cards and we would put 3 ok silvers and one good silver and we will get 1 good gold! isnt that simple
and the level of the card will be one more level that the card with lowest level that was used to trade in/up
soo for example if you would put 1 bad card (1lvl) and 3 good cards (3lvl) you will get ok card (2lvl)
tell me your thoughts about this !