I was wrong, and I am sorry to the enemy color combos out there
Soulherder, Teleportation Circle, and Thassa, Deep-Dwelling are all cheaper and better, but not every deck can run them or wait until the end step

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Brimaz fits those colors, and he will lead the charge in any Arahbo, Roar of the World deck
The answer here is that in decks that are three or more colors, MDFCs have an additional drawback: they only add a single color of mana