As you may (or may not) know, there are currently no masters for either air or aether, because of the abysmal performance from all the challengers. I'm pretty sure SG already has something in mind to find the challengers, but assuming she didn't, what would you like to have happen for a challenger to prove their worth.
Personally, I've always thought it wasn't a players skill that matter, but their devotion to their element. For instance: suppose Tweedle Dee had 6 of every card, including rares, upgraded and upgraded, and he was a global moderator who played 8 hours a day and he helped Zanz program the game. Now suppose Tweedle Dum redesigned the card art for every life card in the game, but has no upgrades and is still fighting AI3. I'll pick Tweedle Dum every time.
So my question to you is this: how do the challengers for the title of air/aether prove their worthiness? Or do we just have air/aether have multiple generals, and let the war prove who's worthy?