Atraxa is a really great commander to experiment with because her ability and color identity mean you can explore about six different themes
The lord effect adds +1/+1 counters to your partygoers, and you can even cast party creatures from the top of your library for some card advantage
When we approach less than 1.60 grams and more than 1.85 grams, it might be possible that some legitimate Unlimited cards exist at those weights, but they would have to be outliers related to printing errors, which would be visible on the card
So long as you're mindful of your limitations on how many color pips you use in your spells, there's no shortage of ways to tweak this list, so do so in whatever way seems best for you
Beyond these standouts, the latest MTG reveals also included a special collectible Traveling Chocobo, which comes in a variety of colours and in a special Gold Serialized Edition