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Castles are in conflict, and Necropolis is still unbalanced; they are automatically discarded. I suggest additionally banning the purchase of a second Venix (it's hard to control, I understand) and upgrading Necromancy above level 1 (possibly with a removal of the amplifier).
Also, for the dungeon, it would be better to ban the starting Shaktar.
Otherwise, what's the point if two interesting races are effectively banned.
Apparently, you've never had a Shaktar with 1 stack appear on the last captured resource, and Lorelei in the tavern, and then he really carries the game).
And if, for example, 15 archers appear for the same Ivo at the start, should he be banned too?).
I definitely think that banning Shaktar and prohibiting the upgrade of Necromancers are not impressive, and if people play with these castles, it will only be in extreme cases))) because everyone has the right to choose 3 castles; no one prevents you from simply excluding them and that's it))))
If you think they are discarded very often, I think that if you do as you suggest, they will be discarded even more often.