On the one hand, you're going to be playing a lot of instants and sorceries
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Even with the bigger deck sizes of Commander, you should only need about 20 legends in your deck to hit something reliably
It also has great abilities to support other creatures, with its +4/+4 buff being exceptionally good and worthy of notes in our Aragorn, the Uniter EDH deck
Tezzeret, Cruel Captain and Daretti, Scrap Savant are wonderful planeswalkers to include with all of these card-drawing artifacts, if possible
The Ur-Dragon is potentially the most powerful Dragon commander with its 'eminence' ability making the rest of your Dragons one generic mana less to cast, even if The Ur-Dragon isn't on the battlefield