I think the default will be fetch a basic Plains and make a 2/2 when the battleifeld isn't pushing in any directions, and that's pretty good for three mana
Where this deck loses out the most is any form of interaction or control
Cardmarket EUR is tracked in parallel for most chase cards on this list, Cardmarket sits well below TCGPlayer right now, but the EUR liquidity is much thinner
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You can untap a beefy Commander after they swing, a tapper Commander after they tapped, another tapper like Arcanis the Omnipotent or Prodigal Sorcerer in Blue or Circle of Dreams Druid in Green to make a ton of mana
All of these effects can be used to either lean even heavier into Trelasarra, or spread power out among your Soul Sisters and develop a small but dangerous army