When a mission rewards is 1-2 gems and you need 300 for a SINGLE SUMMON is a red flag for me,i thought CoA is bad but this makes me see that game as a well done game, Expensive and the only true way to get gems is ads? Oh boy! The worse part is you could also need units to lvl up and if that's not enough,you need Food too! ,I sound grumpy but i really just wanted to point out the flaws it had