The most questionable inclusion would be Rosemane, but with Flower, 2 forests, and the Shieldmates for Convoke, it isn't bad. Dunno how much better it is than just another generic Boros card like Sworn Companions it is, though.

Honestly; I'm shocked how tht deck can get away with only running 5 Red sources. At least one Plains should be a Mountain; maybe even two (since Flower can find you a Plains off a Forest).

Also I'd 100% run that Blade Instructor over the Rosemane and maybe the Sworn Companions over something (Chance for Glory or the second Wave).

that deck was bonkers.
1 loss was due to missplay, if I attacked with a lifelink token, I would have won the next round (probably).
I dropped the Witnesses and Hazadas for companions, gird and some more pump like Vigil. Won one game on the back of Vindicator with auras ;-)
Chance for Glory was an absolute MVP which won me 3 games by itself by first killing opponents creatures and then killing him while tapped out.