What struck me about the Commander is that it is focused in a way that still allows some creativity. Or, it seems that way on the surface. For example, my list below and the list American Spirit pointed me towards as a baseline have some overlap, but they are different enough in the way they play that it doesn't feel like I am stuck with scrambling for the only 60 cards that will work.
However, because the list wants to make use of Pia Nalaar to a large extent, the card choices are somewhat limited. I started off with a small equipment subtheme in the deck because I wanted Skullclamp and Sword of Forge and Frontier but adding more than a few dilutes the deck to such a degree that is never felt like Pia was triggering.
I still have good options with the list so I still enjoy some freedom in the list, but not as much as it might seem on the surface. After playing a few games with it though, I think I am fine with where the list sits. Here is the list I have now:
First, there are two notable exclusions from this list: Passionate Archaeologist and Commander Liara Portyr. Both are missing because they do no exist in Magic Online. Or, well, the latter doesn't. Technically the former does and I saw one player playing it in one of the games I played. But no sellers sell it so I am not sure how they got the card in their collection. And MTGO doesn't say it is not implemented (it does say Liara is not implemented) so maybe that just means it will be added into Treasure Chests eventually.
Anyway, because I cannot get them online, I chose to leave them out for now. I think I care more about Liara as she works with the deck pretty well.
The list I have though is running pretty good. Impact Tremors and Reckless Fireweaver can deal some good damage with the tokens being created fairly often and Goblin Bombardment is another way to utilize the tokens in a non-combat setting as it acts as removal in a pinch if I need it.
Speaking of removal, I did try to keep it light in this deck. I have 4 board wipes, Chaos Warp, Path to Exile, and Swords to Plowshares as my removal options. So far, this has been enough. I am sort of going back and forth on Farewell vs Austere Command since the latter can keep my stuff alive if I need it. I chose to go with Farewell because I feel I can rebuild reasonably well and if I want to destroy stuff, I think I more often want to get rid of all the stuff.
I am still trying to figure out the ramp. Keeper of the Accord has been decent and Stoic Farmer can at least get me a land in hand at worst. The Restoration of Eiganjo // Architect of Restoration is another that ensures a land drop while also either ramping or getting out something like Impact Tremors for free which is relevant.
I do have Mox Tantalite and Sol Talisman since they work well with Pia but I chose to cap the "null" suspend cards to those two for a few reasons. Lotus Bloom is one that might be nice but I don't like one shot mana effects and I have no way of looping it. And Wheel of Fate isn't really needed since I seem to be able to get the cards I need with everything else. Another big reason I didn't want to go too heavy on these though is that they are dead "draws" with the impulse drawing effects. I can't cast them in most cases (some let me cast without paying the mana cost which works) and I can't suspend them so they are just removing options for me to get cards I can actually cast.
Maybe there is an argument to keep them but I don't think so. I also didn't go too heavy on Rebound or Cascade since there aren't a lot of good options for cards with these effects. But, I am certainly open to hearing about anything I missed. Of course, that goes for any card that might make sense in the deck.
Lastly, there are a few value cards in the list that aren't here because of any synergies. I just like them. The two Koths are nice to have, Sword of Hearth and Home is ramp primarily, And a few other utility cards like Wear // Tear and Boros Charm. I have debated on including Sun Titan and Emeria, the Sky Ruin though mana cost and coming into play tapped (respectively) are the main issues. But maybe some day.