Outside of that a fast mana package to back up your combos and stax, some easy includes such as a couple counterspells like Pyroblast, some cheap removal and a manabase that works well enough since you are mono-colored to not stress about your own land hate backfiring and you have a successful Tier 3ish cEDH deck
Also, many stores will offer bonus store credit if youre looking to just move cards into other product
Prosper, Tome-Bound requires considerably more setup to use optimally, but if your deck is already playing a lot of cards that let you play cards from exile, the value it generates from its Treasure tokens can be absolutely silly
Jackdaw A far superior Izzet boat compared to The Belligerent, Jackdaw is an awesome commander with a clear game plan
Fun and flavorful as it looks, early player reaction to the Spacecraft/Station duo has been fairly negative
Price if a "sealed case" is priced far below everyone else, ask why