Love random dice, but saving 2500 gems to get legendaries because coop chests almost never give legendary dice makes this extremely pay to win. Getting 40,000 gold for the chance of legendary in store is next to impossible unless you spend all your gems, which farming enough takes at least 2 weeks of daily logins. This game needs a lot of balancing, by rank 15 if you don't have growth, star, and fire dice, dont expect to win much.