You'll gain a ton of value with the latest food synergies, and token creating abilities are always strong as is the possibility of scry 2 every turn
Another of the self-replacing cards is Robin Hood - Champion of Sherwood: a perfect fit for a Robin Hood deck and a great way to gain lore while controlling the board through challenging
You may be familiar with a few of them: the most popular cards for solving the 10 problem have been PlusPower, Crobat G, Jolteon*and Strength Charm
But that is a space you can explore
That said, a Common might be the most frequent card pulled from a "core" or quarterly tentpole booster packs, but an Ultra Rare might be the most frequent card in a non-core booster if that booster is an all-foil release
I'm excited to see what crazy builds people make, and I'd love to hear what commander you're looking forward to building