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And don't even reveal that Inferno is your favorite faction. Besides, the Altar of Destruction costs as much as the Altar of Eternal Enslavement.
Basically, if you buy a laptop for $1000 and spend a month trying out all the factions in Heroes 6, you can beat anyone with any faction. "Patience and hard work will overcome everything!";). But the question is, who has more experience, determination, and intelligence among the opponents? EXPERIENCE, and again EXPERIENCE, and of course, brains are needed; without them, experience will be of poor quality. When you start playing, everything seems impossible, but later, after gaining experience, it seems like everything is easy.
Another bad thing is that when you kill the main unit, the summoned unit also dies, but in Heroes 5, the summoned unit remained, so Inferno was significantly weakened.