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This creature's controller and that player each draw half that many cards, rounded down." Preventing player damage (or damage to your MTG Commander) is a pretty powerful play, especially when the only cost is allowing you and your opponent to both draw cards

Everything else is a small enough part of the meta that its not hugely relevant

The cards that boost consistency, and provide minor but meaningful advantages, all while not really taking up real card slots

When paired with new Secrets of Strixhaven commanders like Rootha, who turns every big spell into a token-generating machine, Magnus effectively makes your entire deck cost next to nothing