Mechanically, it is more or less a rework of Rapunzel - Gifted with Healing from The First Chapter, carrying almost the exact same effect, but as an action card, and being potentially slightly less flexible in real play
Those creatures also can't be devoured by Bloodspore Thrinax
Insured storage: A named, professionally run vault protects you if something goes wrong
Brothers Yamazaki allowed you to have two of the same legendary creatures in play at the same time
This deck has a solid core of aggro threats, Pheonix Chick and Bloodthirsty Advasery, that is enhanced by cards like Mechanized Warfare and Kumano Faces Kakkazan, which enhance the power of those threats
And then comics went back to the same well