In Deadly Disguise, creatures are cast undercover, either through morph, disguise, cloak, manifest, or something else that has them enter the battlefield face down rather than face up
I would also consider one or two copies of Arabella, Abandoned Doll, which rewards you for going wide with small tokens while acting as a Gleeful Demolition target if the need arises
The Typal spell alone is so powerful that it sets up entirely new infinite combos
His attacks are varied but largely easily avoided, and once you have his attack patterns down to a certain extent, you should be able to handle the fight very easily
Ancestral Recall provides triple that card advantage for a fraction of the cost
With that, kantaro has managed to give the card a certain storied feel, as if this is the very moment the Legendary Pokmon appears at Prism Tower and saves Lumiose City