I started this game before one month, i dont buy spell book because need pay 10€ for it, After buy book u get new missions, point rewards wish can use to buy card packs, colect cards or sell them. Game is seasonal, and some cards can get only 1 in that season. I saw some card can sell for like 15k €, so if someone is lucky from 10€ can make 15k€. I think free to play u cant get nothing. Game is very simple, pick team, fight and colect points. In begin, i lose almost every duel, because i dont know card meanings. Anyway i find way to use one tank card, one healer, and rest team use magic or range damage. Point is kill enemy tenk so you can easy kill rest of team. U can use random cards, random champions and random tactics to win match, that is on you. Is not point use card cost 8, u can easy kill that card with 4x2 stars cards, to for this game need use little brain. I test game on phone and on pc browser, game work fine, no lags.