Just Started .. How to Level up cards ?
I have just started playing this amazing game and I have also bought some cards and they are very helpful. After playing for a week or two I have realized that level 1 to level 1 fight is ok but if some high level opponent comes then defeat is must. So now I am thinking about to level up some cards but it is never an ending processes. Any suggestion for me how can I level up and which cards I must consider ?
Help is appreciated.