And you also collect the Might of the Dragon Father and all of Armageddon!!! :) And with expert fire, a fire sphere, and 50 magic power... Ugh! You become a god. Although you can use Armageddon with just ifrits or other fire-resistant creatures :)

So, it turns out that there is an imbalance in the third game. I hope there isn't one in the fifth.

50 magic power... it takes a long time to play, and you also need a suitable map;) You probably won't achieve this often.
And then, the opponent will see that you have 50 power, and he will have a sphere of prohibition or a cloak of renunciation, won't he use them?
And you'll fail with your power, because then attack and defense will be the deciding factors!
There is no imbalance. There is balance in Heroes.

By the way, if I remember correctly, someone said that combined artifacts are only in In the Wake of Gods? Well, they are at least present in Armageddon's Blade!