Is Conflux a broken castle?

I just played online against Conflux. In the final battle, the opponent had 24 Phoenixes, and I only had 9 Golden Dragons, plus he had Armageddon. I had Vulnerability Sphere and Explosion! And in the battle, Conflux was completely destroyed! Also, I cast Antimagic on the Elves, so Armageddon didn't affect them! In short, the victory was quite easy.
I think that Conflux is strong, but not strong enough to ban it!