The tenth stage of the "Van Kanigem" tournament.

Well, it's simple for those who know how to play Heroes 5. Maybe you could suggest something else. Perhaps a campaign to play – there's still plenty of time.

You can play the original campaign as a Mage, but it's the 6th one, so you'll need to find a place to download a starting save file; these questions were discussed somewhere on the forum. But the hero Zephyr is too specific; he immediately has the Summon Elementals spell, which is level 4. It's better to play individual scenarios as a Mage. Although, in my opinion, a tournament map is no worse in terms of learning.
By the way, as practice shows, you can take prize-winning places even in offline mode, playing for about 2 hours before the tournament. For example, Romanuel will practice a lot and take first place, and we'll be surprised.