Another fun card you could use to prevent blockers is Magmatic Chasm

Also, will you be replacing Inventor's Apprentice because you get less value out of it due to there being a minimal amount of artifacts?

That's the plan at some point, yes. I left in 2 copies because 4x Bomat Courier is still in the deck, and that allows at least some chance to hit the Inventor's Apprentice trigger. Even if I don't have an artifact in play, though, it's still a 1/2, so that's not bad for the single mana cost. For now it is worth a couple of copies, I think.

Stensia Masquerade possibily? First strike is always valuable, plus it can pump the vampires. Then again the 3 CMC slows the deck down.

I found a gem for you, and i don't know why it took us this long to find it, Scourge Wolf.

Riclamin_Silentread, yes, I think it is a bit too slow. It's a great card, maybe not for this particular deck strategy, though.

viperfang4, hey, I forgot about that card. Nice call. I might try that one!

i feel like it wouldn't be that hard to reach delirium in this deck with bomat courier, multiple discard outlets, and a decent variety of card types. 2/2 double strike for 2 mana is nasty. Possibly even a couple tormenting voice thrown in there. I do still think 1 Kari Zev, Skyship Raider would help.

viperfang4, but that's a different deck with a different strategy (getting delirium). This deck is about swarming and speed.

I am saying this deck could reach delirium basically unchanged, you have 6 card types mainboard and 6 discard outlets. Scourge wolf at worst is a 2/2 first strike. Also, tormenting voice would not be bad for the deck for card advantage and sifting. 1 kari zev would be nice though, it is a 2 drop menace first strike essentially swinging for 3, that needs 3 blocks and the monkey token is free killing things. Skin Invasion and Otherworldly Outburst seem to be nice with Consuming Fervor, Courier sac itself, Neonite sac itself, various things dying. I also do not think you are discarding enough for Flameblade adept and the 2 cards above might be better. Invigorated Rampage and Rush of Adrenaline both seem better that Brute Strength. Cartouche of Zeal could also buff a creature, give haste, and stop a blocker. I love he deck, but i still think there are a few changes still, especially when it is no longer heckbent.

Thinking about your most recent comments about this deck running out of steam around turn 5. What do you think about Zada, Hedron Grinder? Seeing the 4 CMC I know is a turn off for this deck, but think about the possibilities, Brute Strength, Built to Smash, and Otherworldly Outburst become devastating. Choose it for Renegade Tactics or Expedite for absolute silly card draw for 1! Could be worth some testing to see if it could save this deck from the late game lull.

Murkatron, that's a very interesting idea. Indeed, the "Red Deck Wins" strategy has had a resurgence in Standard, and there are some interesting builds that seem more resilient than this build. Your idea might be a good way to elevate and get there.

Thanks for the suggestion!

Add the new deserts to the deck to give you late game gas. Ramunap Ruins Sunscorched Desert and 2 Scavenger Grounds works very well.