see i will dump it down for u.. those rewards which u get with the chest box.. u dont need them bcoz they are emojis n shit.. it has nothing todo wid u using actual cash.. u can easily get all the major cards of 1 clan by playing easily.I've heared of that one, never gave it a go because most reviewers said it has a shady reward system. Bosses drop chests which contains items but in order to open those chests you need to BUY A KEY with real money. Now that's milking the cow isn't it?
Path of Exile also has a microtransaction system but that is only for the cosmetic stuff. Anyways i will give Duelyst a try.