I did not get banned but don't just literally spam skills in pvp, just put some gap when using skills or you risk of being suspicious with your enemy. I've already stopped using it since I've already finished the arena achievement to platinum. You can get the mod here...
It works in pvp but it is somewhat doesn't synchronize with the server's data when you are doing raid. I've experience that even all my hero has full hp, one of them was considered dead by the server after I defeated the dragon.
Are all the heroes in your team has been upgraded to 4 to 5 stars? How many artifacts can you get in 50th tower? I have been participating to arena and currently on gold league. Maybe I should consider minimizing my presence in there. But never considered participating to raid since your friends...