The most challenging maps for you.

I finished playing a pretty good map, "A Beautiful World". The result is relatively good: a 6-3-6 victory with 492 points. The map is mainly strategic, but there is also a clever author's plan that the player gradually uncovers: each of the opponents lives on a large island, from which you can only sail away in a couple of places; also, it's not easy to get to the mages in the north: you have to wander through caves for a long time; there is a key Castle, from which the path leads to the islands where neutral dragons live, as well as to the cartographers.
By the way, the map received the "Golden Brush" award; you can read Sir SuperStar's review at the link.
The player can play as any of the 8 factions; I chose Rampart. It wasn't too easy to play, especially because (maybe I was just unlucky with the setup) out of all the important 4th-level spells, I only got City Portal in my cities. Meanwhile, Turquoise managed to get a lot of phoenixes, leveled up, and was the most formidable enemy for a long time. It was difficult to fight until I got Resurrection, so I had to master various tactical tricks to minimize losses. Another observation: Flight and Dimension Door are prohibited on the map, but there is a Tome of Air Magic, and in the middle of the game, I saw enemies "jumping" a couple of times; but then the "jumps" stopped, and the Tome of Air Magic disappeared without a trace...
I won't tell you everything: play it yourself! I'll just say that later, after defeating other strong enemies, Shiva turned out to be the most evil: she was much stronger in terms of primary attack and defense skills, and she had a Sphere of Inhibition! So, I saved her for last and defeated her at the end when my miners dug up the Grail.