Found how to fool the system! U guys open chest without enough gems to get cards to max units! WROONG. . . Here's the thing. . . U actually don't need cards, just enough for 1 single lvl then upgrade until its max buuuut not in lobby you need to max and possibly get new units by reroll in rewards after an opponent, then max it out without stop! All this IN GAME! didnt test it on lobby i got ban just by open chest after tutorial! and thats it! Have fun!