Like many people have pointed out, Wizard Towers are easily the least effective buildings on the strategy map. This is because Dragon Skill cards are only useful when the player is commanding a fight personally and, even then, only if they haven't researched the skill already. The net result of this is that players just don't build Wizard Towers because the gold would be better spent on Hunters or saved up for building another Tavern or Factory. A lot of suggestions have been thrown around about changing the nature of the cards, but I feel that solution is too complicated.
My easy solution is to make Wizard Towers contribute to your research score, just like Academies do. Canonically, Maxos the Wizard does provides as many research opportunities for you as the Imp Mechanic does. Then, even if the cards are useless, there's still an advantage to making the occasional tower as you get a research bonus. It would be simple enough to implement without having to rework the entire card distribution model.
