Personally, I would have wanted to make the game shorter. Something between Academy and Arena, like a customizable apprentice mode, would have been great. Of course, this sort of Mage Wars would probably have very different gameplay from both Academy and Arena. Would also need its own Mage abilities and spells.
Another thing that bugs me is that despite the really high number of possible decks you can build in a particular metagame, new expansions will be introduced before you have the chance to explore them all. This wouldn't be a problem except that people don't seem to really play block formats much, at least not on OCTGN or at tournaments. If I made Mage Wars, I would find other ways to keep the gameplay fresh and exciting with the cards that already exist besides just introducing new cards to the card pool. For instance, when an expansion gets released, I would set up block-format events for it. Like, what if Druid vs Necromancer had come out before Forcemaster vs Warlord? What would the metagame have looked like? This way you could actually find that out. I would also be focusing more on the setting and story of Mage Wars. Nowadays if there is no expansion for a few months, interest at least on OCTGN dies off until the next release. Since the organized play results are supposed to have an impact on the story, producing and publishing the story material that results from organized play would provide more incentive for people to play more often because they want to find out what happens next.
I would also get a bunch of people to figure out what if anything is going wrong with the wizard by doing the tests that Wtcannonjr and I proposed in another thread.
Also, I would have designed the priestess to have a more combat ready stance instead of looking like she's performing a bit of dirty dancing. And I would create blank Mage cards so that artists could buy and sell custom Mage art to put on them. I mean, in miniatures games you can paint your minis, and since the mages are all different people (I.e., no two warlocks in the story look exactly the same unless they're twins), there's no reason not to be able to have custom Mage art.
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