It also includes some of the reprints as appropriate so you can get a sense of how Avatar: The Last Airbender stacks up against existing commanders
I get the desire to hard cast cards like snacker but adding the necessary support for that reduces the decks consistency, which is one of its strong suits imo
However, some restrictions are implied naturally by common sense and plain physics
Many of the devoid cards from Modern Horizons 3 have abilities that help with color fixing, whether they give you Eldrazi Scion tokens to help with your colorless production (Spawn-Gang Commander), turn your Eldrazi multicolor mana dorks (Path of Annihilation), are MDFCs (Drowner of Truth), or change how your mana can be used (Abstruse Appropriation)
Post- Modern Horizons 3 , we have access to all 10 triomes, fetch lands, and shock lands, plus the surveil lands from Murders at Karlov Manor