Wow! Try Aurelia, the Warleader. I know the mana curve would be messed with, but the additional damage might be all you need in a do or die situation.

Thanks for the recommendation, Psychic! That's definitely a great point. Normally I'm not a huge fan of cards that give extra turns (or in this case, combat steps) but I could see myself using it in a "do or die" situation like you said. I'll keep her in mind! Thanks again.

Never been a better deck to run Anointed Procession

Grenzo, Havoc Raiser is another good fit to prevent people swinging back

You're definitely right on Anointed Procession, LeoSushi. I'll definitely find a place for that one! Thank you for the suggestions and the +1!

as long as you're attacking all the time, Invasion Plans lets you make all their creatures fall right into a token, and have the rest of your board go unblocked, and as long as you run invasion plans, you have to run Infiltration Lens for that sweet sweet card draw combo (the effect happens equal to the number of blockers)

Slate of Ancestry might just be the single most powerful card engine in your deck, Skullclamp has a similar effect as well. Trust me, boros decks need card draw whenever they can get it

Crescendo of War is a pet card of mine, Incredibly powerful even if it only sticks for a few turns