How does it work? Who knows?
A really weird mix of card advantage and tempo. You can contest the board against aggro and generate to much card advantage for control. Meanwhile mid ranged is stuck in a strange world of 8 cost harsh rules and 12 cost heart of the vault. Try to keep your fanatics and feast callers alive as they will win the game if left alone. You have tons of tools to do so. Don't be afraid to drop Fanatic a before you can protect it as your opponent will most always leave it at least a turn.