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It seems that many players have moved away from duels; I rarely see dexterity builds on the server, or perhaps they've changed accounts. As for Axe-Karl, yes, Karl made quite a few mistakes there. The right combination of runes and tactics gives Karl an advantage over many strong dueling heroes, such as Orc and Leathos, for example.
Razaz-Marbas, well, it's just pure tactics, nothing fancy. It all comes down to skill in playing the fifth installment of the Heroes series.
I'll add my own replays; I have quite a few. By the way, hello everyone, I play as "Galvosukis." I found this puzzle game with my daughter.
1. Sinister-Deydra, an elven classic. And yes, I made mistakes with Deydra regarding the setup and initial deployment. But I was a little lucky, and Sinister also made some setup errors.
2. Iris-Erin. It's better to watch the replay with Domovoi; he plays much better there.
And further on, I'll post whatever I have. I'll especially highlight Helm's victory over Osai; the terrain helped a lot, and the opponent was playing quite well, making only a few mistakes. Although, I think I could have won with Osai there.
There's also a replay where Vitya defeats Helm (but it's not available right now). The tactic is based on words; you just need to catch the Jarls at the right time, when Helm casts regeneration on them, remove Vitya, and try to destroy them afterward. Because they will most likely have little or no armor or dodge. And, of course, you need to fly away with the griffons from the first word. This tactic is based on small probabilities, but it sometimes works.