Is the artwork a standout
That said, this deck can easily be made more powerful than it already is by swapping Machamp for Machamp ex, or swapping Mankey and Primeape for Cubone and Marowak ex, if you have them

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Thran Dynamo is fairly efficient for cost to mana provided but it seems most of your mana needs are for color
Shadow clearly has a ton of potential, and I think it goes beyond regular, casual Commander