After a few weeks of testing and discussing different decks with friends, not to mention watching a lot of Twitch streams and YouTube videos , I settled on playing Arceus VStar/Mewtwo VUnion
Thats a lot of options for Commander
Internal dimensions of acrylic case: 590 x 315 x 55mm
Notably, the returned Rats don't need to be among the cards you milled, so if a powerful Rat gets removed, Ashcoat can easily get it back so long as you don't mind milling four cards (and that effect can play into graveyard synergies too)
Retailers may impose limits (per person), and many boxes may go online only or via special promotion windows, making it harder to snag
Chatot Chatot is a reprint of its Mega Shine counterpart, and being a Colorless type, it can fit in any deck