The general idea was to create two opposing armies, emulate a bit of warfare between them with white on the losing side, and then add a touch of chaos in the form of extra minions sprinkled around. Beyond the chaotic elements, the challenge is supposed to essentially say: "win this losing position", and so the generator is made to attempt creating that type of scenario. The downfall of course, is the AI missing a few brain cells on how certain mechanics work, making half the challenges roughly amount to exploiting certain effects or behaviors, rather than anything else. v0.54 solves this, to some degree.