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Legality depends on the tournament format -- Descent into Madness can be legal in some formats and banned or restricted in others

Going by EDHREC again, it seems Birth of the Imperium is currently in 70% of posted Tom Bombadil decks

Since the Beginning Phase includes the untap and draw steps, youre getting more Mana, Creatures get to untap, and also gain an additional card

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Much of the advice will hold true for other MTG formats as well, but if you're working on an EDH deck, our guide to how to build a Commander deck has more specific advice for you