Thunderlord's Decree
I honestly don't think that this mastery is OP, but there is something wrong with it, and no one can deny that. Just go in a game and atleast half of the players will use this mastery, how can that be called diversity? I watched some high elo streams (Bjergsen, Trick2G) yesterday and they had games where litterally 10/10 players would use that keystone. I thought Thunderlord's would be a good keystone for all combo mages, not straight out for everyone.