In your opinion, which faction is the strongest in Heroes 5? Let's discuss the advantages and disadvantages of each faction.

This is possible if you're playing against a human. But against the AI, it's not certain that it will use those spells, and it's also not certain that it won't lose those skeletons during the game. Moreover, 1000 archers can be transformed into 1000 inquisitors with a single, elegant move. And that's a completely different story.