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Dream Devourer Dream Devourer is a niche card, and a novel one at that

And all of this is just taking it into account as a 1-drop

Its possible that some time in the future of Standard the mana dries up and we see mono-colorless or close to it pop up, or a single card gets printed that makes a deck in an Eternal format tighten up its mana, but odds are until more sets are printed with this mechanic, mono-colorless isnt much more viable than it is now

Yuma also evolves his Xyz monsters into Chaos forms, a technique both he and several villains use when New Order is its "Light" counterpart that Astral ought to be using