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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)

However, some restrictions are implied naturally by common sense and plain physics

Fragmentize Another 1-mana answer very similar to Natural State, Fragmentize has been a potent Vintage card ever since it was printed

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