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The Lizardmen are definitely underestimated in the swamp. I've always been curious about how the monarchs' poison ability works; it has about a 50% chance to trigger, even with counterattacks, but I've never managed to reduce the HP to 50% of its initial value. Has anyone else managed to do that, or does the battle usually end faster?
Overall, it's an interesting castle. The key is a quick rush at the beginning and a well-chosen hero. Although we can only build up to level 3 in the magic tower, with proper development of our witches, most of whom are offered air units right away, we can create a good army early on. After a successful rush, a good mage with units that have spell-removal and disable abilities is helpful. After that, it depends on how things go. In my opinion, Stig, Mirlanda, Tazar, and Vistan are must-have heroes. The latter, by the way, can perform well with these universally disliked Lizardmen thanks to their defense. Bron is also an excellent hero, especially with 7 basilisks at the beginning. In general, in the swamp, you can always adapt to the situation by 160-200%, and that's a good thing.