In Fallen Empires, we get some instances of multiple versions of the same card, notably our first look at a Goblin who seems employed, albeit not exactly skilled
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Sacrifice artifacts to Breya, Etherium Shaper for removal, life gain, or direct damage
run Fervors to give those tokens haste, run Aggravated Assault to get extra combats and therefore extra +1/+1 counters from Edgar Markov, and run any/all of the cheap vampire creatures and their associated lords
I think this deck is going to become a new Boros mainstay even after the hype for this set dies down
Ideally, we would remove some of the fringe mechanics like Myriad and Vanishing, but it's good to know what they do, and the cards that utilize them are fairly straightforward