Kassadin has the best potential for an ultimate skin

While Pulsefire Ezreal was a cool skin, Ezreal was easily one of the worst choices for an ultimate skin. He has no interesting mechanic that you can base the transforming models off of. Of course, he was the first ultimate skin. Udyr, however, had a great mechanic to base the multiple models off of - his stances, and so Spirit Guard Udyr shows that an ultimate skin is cooler when its not just "transform at 6, 11, 16".

I think Kassadin has the most interesting mechanic that could be exploited for a multiple-model ultimate skin, his stacking ultimate. Kassadin would enter riftwalk in one form and come out in the other.

There could be several skin concepts that use this:

• a "demon" Kassadin where he starts out mostly human and transforms more demonlike as he ultimates
• a mecha Kassadin where he upgrades when he ults (increased mana cost is like requiring more fuel to power the better suits)

thoughts?