The Extra Deck
We only have one in-archetype Extra Deck monster - namely Garunix Eternity, Hyang of the Fire Kings - which means we have 13-14 spots to fill up with generic/non-archetypal cards.
The strategy outlined in this guide does make some Extra Deck monsters mandatory, like Promethean Princess, Bestower of Flames and Amphibious Swarmship Amblowhale, so realistically, most decks will have about 6-8 spots where you can run anything you want.
As before, we'll cover plenty of options so you have what to choose from. The mandatory/heavily recommended cards will have a note that looks like this, so keep an eye out for it.
Let's get started!