I didnt buy the argument of Lightning Bolt and Bloodbraid Elf keeping the card in check, as I played with Jace a lot in Standard and in Legacy, where both of those cards were legal yet the planeswalker ran rampant
A modal double-faced card can't be transformed or be put onto the battlefield transformed (even if one of its faces was formerly part of a transforming double-faced card)
Perhaps the biggest hurdle for Boros in Commander, though, is the lack of alternative win conditions
Bitterbloom Bearer One of the most expensive Lorwyn Eclipsed cards, Bitterbloom Bearer, is proving to be a hit with Commander players already, thanks to its ability to create 1/1 faerie tokens at the beginning of your upkeep each turn , at the cost of one life
You could draw infinite cards, but that many card don't exist, so it's probably not a great idea