Found something amusing. As you all know, there are two heroes with the same name in the game – Dragon. One is just a Swamp creature, and the other turns Mages into Wizards.
It turns out that if you take the Swamp Dragon and visit a Barbarian Castle, and then exchange his creatures for resources, you'll get Wizards instead of resources!
This needs to be added to the rules – the Wizard should be banned.