Is Conflux a broken castle?

Skeletons have 6 hit points! And phoenixes are cooler than spirit dragons!

But if you put a bunch of vampires against them, who regenerate after each attack and don't take damage in return, what then! And liches attack adjacent cells. Fight fire with fire. Each castle has its own advantage, and don't forget about necromancy; you can raise skeletons after a battle. And humans have a living archangel who can resurrect a legion of fallen archers. No, everything is balanced; there's no cheating.