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Well, I cant exactly blame you, as he hit in a heavily blue-oriented artifact set: Brothers War

That being said, I think the reasons for a card being banned can be broken down into two main categories: A card is too powerful on its own and almost every deck has to have it to be good

Build and Buy a Commander Deck Yourself Spark of Creativity | Illustration by Johann Bodin If you dont want a WotC Commander precon but the player-built custom decks are too expensive, your best bet is to build the deck yourself

Know the current legal card sets Its basic, but a necessary point for both new players and older collectors alike