Regarding Conflux, I would recommend banning this Castle altogether in tournaments, as it is inherently more advantageous in any situation. Unless the Necropolis can compete on XL... When I participated in online club tournaments, the rules specifically provided for this. By the way, they also prohibited leveling up Cyela, as her ranged attack also provides a bonus in the early game... The Castle is very good due to its growth rate, mainly... and therefore it doesn't fit in with the other, fairly balanced and equivalent ones...
Playing with it isn't the most interesting thing to do:) That's just my subjective opinion, but I can also get into a debate!:)