I feel like Sylvan Caryatid is a way better fit than Soldier of the Pantheon

A playset of Mana Confluence is a must for early game fixing in three colors.

I disagree TheBossMeow he just needs Sylvan Caryatid .

Through testing, all I needed was Sylvan Caryatid. I took out Boon Satyr for 2 Brimaz, King of Oreskos an extra Elspeth, Sun's Champion .

I'm not entirely sure about the sideboard at this point.

might want to look into sorin, solemn visitor

I agree, sorin is great. I have a similar build (although I don't take a removal heavy approach, more as the aggro approach) but depending on how high you're willing to curve (seeing as elspeths in the build, I don't think you mind) Ivorytusk Fortress is a big beat stick that synergizes with your counters