There are plenty of powerful Boros cards from Guilds of Ravnica that should be great additions to this deck
It rewards skill over luck, offers no dead turns, and brings that one-on-one tension Magic players know so well
Remember that you can gain from combats that dont even involve you: The opponent on your left attacks the opponent on your right, each has creatures that die, and you get to put any nontokens face-down on your side of the board
Vraska, Betrayal's Sting is a flexible proliferate option that also acts as removal or a finisher, but personally I feel she's a bit overcosted at 5 mana minimum
The Scorpion Dragon text is enough for me to forgive that missed opportunity, and Magda, the Hoardmasters a great treasure payoff that turns your stack of gold into bodies and damage
Thus, many Magic cards from that 1993 Alpha set are now worth thousands of dollars