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I am responsible for the rules.
After much discussion about the "hit and run" tactic, we agreed on a formulation that prohibits a hero from casting spells in the first round and then fleeing.
Units and assembled artifacts can cast spells.
The rule was adopted in this form because it is the easiest to understand.
If you are not satisfied, discuss it; if there is a lot of dissatisfaction, I will consider what can be done.