Kudo is a cheap Selesnya commander thats easy to bring back
Reflecting Pool works well with those "any color" lands
This answer makes it seem as though it could be a valid choice to randomly decide to have more than 60 cards in a Constructed deck "just in case"
Erikas Tangela, Lillies Clefairy from Journey Together, and Pikachu Scarlet & Violet Promo #088 are our personal favorites in this category
Get the Bleap card Promotional and Special-Release Cards: The Scarcest Segment Promo cards distributed at events, in merchandise bundles, or via player rewards programs represent some of the scarcest items in the entire Pokmon TCG
The second, and perhaps most important, is that most cheap removal spells are almost universally one color, meaning that dispatching Zenith Chronicler with something like Cut Down or Voltage Surge won't be difficult at all