Ratonhnhakton costs only 3 Mana, so casting him multiple times through the course of a game is very doable and should be done if you are in need of a finishing blow
It is gorgeous, but not essential, which is the best kind of fancy option
Decks that want this type of cards are usually sacrifice-oriented commanders, and Ive seen a Kazuul's Fury + Body of Research combo deck in its Standard format as a viable option
Worse versions of existing competitive commanders/decks - another facet of what makes a deck competitive is not choosing to play something that's consistently going to perform worse than another build with the same strategy (for example Prime Speaker Zegana/Keruga, the Macrosage could also be a solid Simic Food Chain deck, but Uro, Titan of Nature's Wrath is the best choice for this kind of deck for cEDH)
Security also worth stealing. Dack Fayden Watermark: Conspiracy Seal Illustrated by Adam Paquette Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Banned Comp
The collection will also serve as a mini-launch for a series of MTG cards we know are going to cause fans to go as mad as Thanos