The first and easiest thing is land spells. Those are most likely all in, as even bad ones are worthy options and add needed density. The next step is exploring the Anni/earthcraft/untap effects. A critical mass of them could lead to a pseudo storm engine as they are "free spells". There isn't enough of them nor the penetration deep enough for consistency though. So we shouldn't bank on setting this up, although something like past in flames could do it. However they are still essentially draw two when enabled, but not really worth it when not. So we are still advantaged to include as many as we can justify. I think all of them that permanently modify would be worth it, acting as trick and building our Voltron team flavor wise through "experience". That leaves us 6 plus nature's chosen.

It then behooves us to put in protections, to ensure our modifications don't fall off. We need permanent protection in specific, things we can use proactively and reactively, but generally won't be able to guarantee specific timing. I think this rules out effects like angels grace. Also, so we continue to use spells, shroud and protection from colors, because of non bo potential. I then cut temporary effects that he proof or Indy but not both as we are replete with options, and color hosers that have timing issues. Flawless maneuver is a good acception, because it's free and affects the team. Flare is the same, and we get a grace effect we can use proactively. Red elemental blast and pyroblast are worthy considerations, as they do have timing issues, but the second clause let's us use them proactively and usually kill at least one commander incidentally all the time. There are so many good team options that I eliminated all indiv with the exception of boon of safety which has an indi counter and scry. If need loran's escape, that's stand, and Tamiyo's safekeeping would be the choices. The hexproof ones with counters were tempting, but to situational to be included for the counter alone. It was close, but hexproof is not untap. Out of the side I cut any card that was draw without other upside, or haste as that was a timing thing. I cut first strike as double strike is available, but left trample. It's unclear if I am going lean into incarnations or not, so that's undecided as is mill. I've also left removal, CA, and recursion as I think we will figure out later what we want in this regard. I've cut the silence and flash effects due to timing.

So above is the base to be added, and below is tools depending on direction we need more context for. That's 15 1cmc instants we play for their own sake!