Hey guys, just saw you discussing the posibilities and thought i'd give you my input on this. Gems and silver are server sided unfortunately, theres no way around this.
I tried messing with the tavern, modifying the lvl values and got as far as to freeze them at lvl 30 (for a 3 star champ). The thing is it only freezes the bottom part of the lvl upgrade bar (where you can see how much exp is needed for the next lvl) and there it says that the champ is maxed out at lvl 30. It does not modify the lvl value in the champ's icon and so it doesnt allow me to upgrade its rank.
Also, im new to GG so it will take some time to see whats what. Any tutorial suggestions are welcome.