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Steelclaw Lance also rewards playing a density of knights (but is a fine equipment even on a non-knight)

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

Archmage's Charm has some versatility, but since it costs three blue mana, that pretty much limits it to mono-blue decks

However, for those brave enough to stick it out and remain in this austere academy, please read onward