Single-target pump spells are rarely seen in Commander outside of Poison decks, because their effect - helping a single creature win a single combat - is so small compared to the infinite combos, massive token armies, and other nonsense that the format is known for
Vial Smasher the Fierce seems like it would work better with Ludevic, Necro-Alchemist (and I honestly thought about pairing those two together at first), but hear me out
Sephiroth, Fabled SOLDIER / Sephiroth, One-Winged Angel Death triggers and life loss go hand in hand, and they rarely look better than on Sephiroth, Fabled SOLDIER
Invoke the Divine
Sadly there isn't an Avacyn card due to one having a high mana cost, one being boros colors, and the other one not really fitting into the deck very well
Having Hexproof is nice and makes you feel safe, but I ran Aegis of the Gods in Azor for years and it almost never saved me from anything, not only because having hexproof isn't as strong as it seems but also because people will want to kill it very quickly if they do need to target you
