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Long story short, I used to run a monoblack devotion deck that had only swamps as lands in it, but it also had Resolute Riders and Deathless Knights, so it was marked as an Abzan deck. But now it switched to monoblack symbol, so I experimented a bit: having dual lands, pathway lands, "add one mana of any color" lands and even permanent cards of a different color doesn't change anything. So only basic lands now determine how your deck is marked in your collection.
BRB experimenting with decks based on nonbasic lands only.
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