You'll likely have the best luck searching at thrift stores or online
Artifacts like Urzas Sylex, Nevinyrrals Disk, or Oblivion Stone warp opponents playstyles around the threat of mutually assured destruction and certainly have their place in Commander, and in the case of Sylex, tossing an extra two mana during activation to Call the Gatewatch might be just what you need to break parity following extinction
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Good side deck options are "Electric Virus", "Chain Disappearance", and extra "TG1-EM1"'s
The Step-Up Battles are permanent additions to the game, meaning you can complete them anytime you want
The boon cards are essential to keep the cards flowing while you attack your opponents to death