i like the idea of a card shop, that could be really good, as it would encourage play over over Kongregate, not just on Kongai, so as to get badges and earn points.
Definitely a higher chance needed to obtain cards, and additionally, what about a further increased chance for beating someone over your level? maybe also an increased chance by beating someone without losing a man.
Also, Ive been having problems with people getting behind in matches and not resigning but simply allowing the timer to run out every turn, thus making me invest 20 minutes if i want to win a battle. This should be changed to be prevented
 "Great Game 1/5"){kind=icon}
 "Morningstar"){kind=icon}
 "Music Catch 2"){kind=icon}
 "Kongai"){kind=icon}
 "Temple Guardian 2"){kind=icon}