I also haven't done this for any other deck, but if you're willing to dish out a few extra bucks I highly recommend picking up Calamity of the Titans, Desecrate Reality, and Not of This World, they're all under $5 each but they are incredible for the deck
Triskaidekaphile is probably worth a slot since putting lands into your hand at instant speed could creep you up to thirteen cards and the win condition, and other than that, the card draw ability and no maximum hand size are going to be useful
Cloud, Midgar Mercenary Cloud is interesting as a card in the 99 for decks that play Equipment or as a commander on his own
Three decades later, Wizards of the Coast releases several hundred new cards every year across Standard sets, Commander products, and Universes Beyond collaborations
Being able to ramp the best land out of the top four cards of your deck at instant speed is already very useful, but the fact that you can still draw one of them into your hand as a fall back means that you wont have a major downside (see Growth Spiral for a similar effect)
Sethron is instantly the better leader for Minotaurs in Commander