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I think this deck has a solid legacy, one that represents the better parts of modern commander decks

You wonder whats in the box

This card gains 500 ATK for each Level 4 or higher monster you control

You can feed all this mana into generic mana costs, X-spell costs, or, with Chromatic Orrery out, use it to cast whatever you like

Spiritually, this makes sense, but mechanically, there's just no color differentiation between a Polluted DeltaPolluted Delta and a Misty RainforestMisty Rainforest, despite there being an actual color palette on the card representing the colors of lands it can go get

This, obviously, lends the unique design of March of the Canonized towards Orzhov strategies, but this fits well in mono white decks interested in doubling ETB triggers like Elesh Norn, Mother of Machines as well