Wicc
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I don't like this principle of choosing the starting hero for the opponent. It's better to have a random hero. Because the resulting selection is quite skewed, and many castles are excluded. That is, you can try it once, but overall it's a rather dull practice.
However, the option of choosing the opponent's castle is quite playable - it doesn't distort the balance of the castles, but it does add strategic depth to the selection.