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Niv-Mizzet Reborn could support a five-color cycling deck, and using Astral Slide to bounce him would help refill your hand.
What exactly do you want your commander to do? Fetch Astral Slide? Be bounced by Astral Slide? Just give you colors?
2023 Average Peasant Cube|and Discussion
Because I have more decks than fit in a signature
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