Curses need a bit of work to fit in a group hug mold, but Ive seen it done

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Knight of the White Orchid upgrades Kor Cartographer, and Ive shifted the creature base around to include stronger and more impactful creatures across the board, like Thalia, Heretic Cathar
More than six is a lot of players and Commander turns can be pretty lengthy, so three to six is the sweet spot
You only need a couple of other artifacts for this to be a 9/9 or an 11/11 for just 5 mana