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Thank you for your response. I decided to run some tests, and indeed, the changes took effect. However, in the current game, I already used the DeployReserveHero command to bypass this limitation. Now, each player has 4 heroes reserved. I did this because the computer player, having only 2 heroes, was too passive, staying in its starting location, presumably fearing that leaving its territory would make it a target for another player.
Moreover, the caster's mana runs out quickly, whereas the warrior hero doesn't have this issue since their buff/debuff spells last over time.