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Okay...
Regarding the units:
Gnolls - they're decent, but with increased speed and the Dragon upgrade, they become a formidable force:)
Lizards - their archers are useless; they can be placed at the end of the queue.
Dragonflies - a preemptive nuclear strike:) They'll devour everyone, weaken them, and even cast a dispel spell just in case. A great unit.
Basilisks - advantages: a quite strong unit with a chance to stun the enemy, making them very valuable on the battlefield. Too bad they're slow.
Gorgons - death to all living things:) I just don't quite understand how to calculate the chance of a Gorgon's deadly gaze, but otherwise, it's a superb unit. Armored beast:)
Wyverns - they can be built in the first week, which means you can grab a lot of mines and artifacts early in the game. In battle, they poison the enemy (-10% of maximum hit points, with a minimum of 50%), which is definitely a plus.
Hydras - slow, but with a lot of hit points and an attack with multiple heads. A wonder unit:)
In my opinion, the Swamp is a very strong Castle. You just need to know how to play it correctly, and then you can crush anyone, even at 300% difficulty:)
P.S. Inquisitor
Have you tried playing with other factions at 200% difficulty? Or only with the Swamp?;)