You got space for some utility lands. I'd recommend Castle Locthwain, Urborg, Tomb of Yawgmoth, Mutavault, Shizo, Death's Storehouse.

Your non-creature spells could use fixing. Feast of Blood is bad. Sorcery speed and requiring vampires means you're casting it turn 3 at absolute earliest.

Doom Blade is also outdated. Fatal Push is on the right track here, as is the above advice for utility lands though I'd add Nykthos, Shrine to Nyx as you're monocolor.

Imperious Sorin is the best card in vampires, period. Should be an automatic 4-of.

Other vampires that are useful here: Captivating Vampire (cut Yahenni and/or Drana, a straightforward lord is more useful), Gatekeeper of Malakir (fantastic value), Viscera Seer (strong contender for the best vampire ever printed), Kalitas, Traitor of Ghet (win condition by himself), Champion of Dusk (Ideal turn 3 Sorin target) and Indulgent Aristocrat (ideal partner with Cordial and Bloodghast)

One last thing: if you have the 4 Inquisitions in your maybeboard I'd use the full set of 4. Hand disruption wins games.

Hey thanks that’s all very helpful. Went ahead and swapped in Inquisition of Kozilek. Now to see if I can get my hands on some Captivating Vampires.

yeah i was too lazy to give actual feedback on nonland cards sorry

Gatekeeper is really good, I'd put it in as a 3 of at least. If you wanna lean more into the sacrifice for value build with Blood Artist/Viscera Seer/Bloodghast/Cordial Vampire etc you can run Kalastria Highborn.

For Doom blade replacements, we have Bloodchief's Thirst, Dismember, Infernal Grasp, maybe Heartless Act. With the new innistrad sets running Victim of Night seems like a bad idea so I won't suggest it.

No worries, I appreciate any feedback you have. The utility lands are gonna be the last thing I can add, but hopefully we’ll get there haha. I’m probably going to make the infernal grasp switch once it’s available. Do you think having Gatekeeper of Malakir in as a three drop would be more valuable than a lord like Captivating Vampire? It does mean I wouldn’t have to worry about having more removal spells as much.

YamishiTheWickedOne Thanks again for all of your input. Do you think it would be worth replacing drana and yahenni with Gatekeeper of Malakir AND Captivating Vampire or just commit to one of them? Also, do you see an obvious spot to fit viscera seer into?

Seeing as you already run Cordial, I think if you had to pick either gatekeeper or captivating, I'd go with Gatekeeper.

Another minor change: I'd drop the Sign in Bloods for 1-2 Champion of Dusk because you have Sorin. Draw power on a 4/4 body is game-changing.

I should mention, I've been giving you advice under the assumption you're working with a limited budget. I bring this up because fetch lands like Marsh Flats, Verdant Catacombs, Bloodstained Mire, Polluted Delta and Prismatic Vista are all extremely useful in vampires even if you're monocolor because they let you reuse Bloodghast up to twice per turn, they can force a shuffle to hopefully get Nocturnus active, and they thin your deck making it slightly more likely you'll draw what you need.

Aside from Thoughtseize and Kalitas, Traitor of Ghet, another expensive card is Cavern of Souls, because having mainboard countermeasures to blue decks is always a good thing.

You are right to assume I have somewhat of a budget. All these fetchlands are pretty far down the line for me, but I’d still love to incorporate them someday. I hadn’t even put together that Champion of Dusk is just a heartier, creature version of Sign in Blood so that’s very exciting.