@Sitedemarde Maxed commons are really powerful. The deck I used to grind Ysadora to lvl 28 had not one rare card in it. It did have 3 scarce cards in it but in order to beat grandmaster I did not need them maxed. try to focus maxing commons and uncommons first and you will find that the game works just fine
 "War of Omens"){kind=icon}
 "Arkandian Crusade"){kind=icon}
 "Dummy Never Fails"){kind=icon}
 "Flaming Zombooka 2"){kind=icon}
 "Gravitee Wars"){kind=icon}