If you want to buff this Commander Deck, other cards that make artifacts hexproof and/or indestructible could certainly be very fun, as barring a board wipe, this would prevent most damage, and help to keep your Commander alive, and annoying
This blade of Arthurian legend gives a creature +10/+0 and vigilance, and its cost of 12 mana is brought down by the total mana value of historic permanents you control
Mana Confluence and Underworld Connections more aggressively, and play Thoughtseize later in the game with less pressure
Enchantment tokens (such as Roles) that are sacrificed, destroyed, or would otherwise go to the graveyard are put into their owner's graveyard before ceasing to exist
Beyond the Staples: Filling Out Your Arsenal While the cards we've discussed are foundational, a truly great sideboard isn't just a collection of strong individual cards