where is a good place to find out some more details about rules and whatnot? for instance, I'm at bronze level 2. it says my summoners level limit for common cards is level 3 which implies I should be able to level up my summoners? but I can't combine them. I have more than one but when I click on the card it only shows one in the list and the combine button is not highlighed. same for rare cards. I cant figure out why...