Wicc
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Well, if an exchange of 15 Gnomes + 50 Centaurs -> 37 Centaurs is considered a "good deal," then almost all castles do it that way.
Here, the task is not just to take the castle, but to do so with minimal losses – so that troops remain for other hives, for defense, and for attacking in swamps, etc.
For example, Goshi's price for taking a castle is much more comfortable – while the flies are eating the defending witches and zombies, the skeletons take out one stack per attack. As a result, it turns out to be quite budget-friendly.
