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Actually, the campaigns lack complexity without special restrictions in almost all missions. If all missions were designed so that you start with a single hero at the Cultist level and one town, it would be much more interesting.
Against Isabel, there are about 7 castles and 4 powerful heroes. The difficulty there lies in remembering which heroes have which upgrades :D.
In this mission, there are also many upgrades, and the most challenging part is navigating them all.