The owner of this deck hasn't added a sideboard, they probably should...
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This deck harkens back to the Brothers' War in a time before 5-color magic. Urza and Mishra nearly leveled an entire plane using only artifacts that they created based on ancient Thran technology. The planeswalker (player) behind this deck is one that looks back on that war with a historic admiration and wishes to emulate that style of battle.
The Arcbound cards are all modular. Try to have a place to put those +1/+1 counters if you should lose them, and, if possible, save anything with a sunburst effect until you have one of each mana.
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