Creature mechanic
It's not a huge discount, but anything with the Kanto generation starter Pokmon is popular, and these are so fluffy
That creates a powerful way to build around him, but you are casting your foe's stuff, not yours, so it's harder to break
Adrix and Nev, Twincasters Token doublers are always a huge benefit to a token deck, and since Adrix and Nev, Twincasters is a token doubler that can be your commander, its a natural choice for this deck archetype
Some of these are problematic with the fundamentals of the format, like Karakass ability to shut off any commander at virtually no cost, or the way Trade Secrets lets you collude with an opponent to each virtually draw your deck
Archaeomancer - in Velkhana Armor with a Slinger, and a Winged Seraphyd Greatsword (from Monster Hunter World Iceborne)