Maybe swap Victim of Night for Walk the Plank as it hits more targets like Zombie lords, while merfolk is arguably better then zombies it would be safer having vampire tribal and zombie tribal covered then merfolk simply 2>1

I'd definitely mainboard those Ghost Quarters. You should have no trouble getting the black Mana you need, so it just ends up being main board Tron hate and more free spots in the sideboard.

Disciple_of_Doran it has always seemed weird to me to sideboard a card mainly only for one deck, but the more I talk with people, the more I hear just main boarding Tron hate regardless of matchup (also due to how common Tron is lately). Thinking about it: you can hit a dual land (preferably a shock after they fetch and shock for lifeloss XD) to harm opponent tempo. I took out 2 Swamps and put in sideboard for matches where Ghost Quarter not necessary. Thanks for the tip!

Anything else you saw that could be improved? IRL everyone I show this to says Bloodghast immediately. Hopefully after saving I can shift things around.

Aether Vial? Could be a good option for colorless land drops.

DistortionSlayer I realized I never replied to your suggestion! I like what you said about Walk the Plank and Victim of Night. I mainly rely on Fatal Push for removal and Victim of Night is so flavorful! If Im playing zombies or werewolves, I usually put in Go for the Throat anyways. Thanks for the suggestion!

Flooremoji thanks for commenting! As for Aether Vial... I know its so good in aggro creature decks. It would be perfect. Maybe after the price drops? What would you suggest I take out? I also want to keep the choices outside of land as black as possible to trigger Vampire Nocturnus

True, maybe cut 1 asylum, 1 lacerator, and some captivators, not sure if that's optimal, possibly even some swamps.

Flooremoji what would you suggest for number of lands? My average is 2.00 and I curve out at 4, but 2 things: Kalastria Highborn and Indulgent Aristocrat can be mana hungry with their effects.

23-22 not any less though.

looks pretty solid.... I think Vampire Nighthawk is worth considering; back in the day i lost many of games against that guy.

Icbrgr thanks for the comment! I greatly appreciate it!

I LOVE Vampire Nighthawk and I use him in my Rakdos aggro build Succumb to Madness. The problem is I have other 3-drops I prefer to play like Gatekeeper of Malakir with kicker, Captivating Vampire, and other 2-drop creatures and my 1-drop hand discard.

What would you suggest taking out for Vampire Nighthawk?

It's a very tough call. Personally I would say nighthawk over Gifted Aetherborn. Despite the higher CMC the addition of flying is worth it imo as SB tech/options

Icbrgr you make a good point. Im gonna swap 2 Gifted Aetherborn for 2 Vampire Nighthawk.

Any other suggestions for the sideboard?

Its honestly a really tight brew.... black has access to token hate cards like Languish and Illness in the Ranks and the only things i can think of are universal SB tech cards like Torpor Orb, Surgical Extraction, Jester's Cap, Glaring Spotlight.... but its all hingeing on what your playgroup is like.

I have been playing mono-black Vampires in Modern for quite some time now. It is actually more competitive than a lot of people think. It's like mono-black Jund, and I've out-Junded Jund with vamps before. But this also means I play much more disruption than the build laid out here. My version runs 6 Discard (either a 4/2 or a 3/3 split among Thoughtseize and Inquisition of Kozilek), 6 Removal (4 Fatal Push and 2 flex slots), 4 Planeswalkers (the best in Modern - Liliana of the Veil), a much lower creature count at 21, and 23 lands.

Now, you have correctly identified Bloodghast to be the best Vampire in Modern. It does everything you want it to do in this deck - it is a recurring threat, you can sac it to scry (Viscera Seer), sac it to drain (Kalastria Highborn), discard it to Lili's +1, etc. The second best vamp is probably Vampire Nocturnus because its ability is just insane. I'd max out the number of Gatekeeper of Malakir because the sac effect is very strong in the format. 4 Asylum Visitor is great for card advantage and Madness is great for discard effects as well. Finally, I play 4 Viscera Seer because it synergises well with the other creatures. With Seer, you can do the fetch land-scry trick with Bloodghast, you can fix the top of your deck for Nocturnus, you can sac your entire board with Kalastria Highborn for extra reach, and you at least get to scry when opponent tries to kill your creatures.

Some comments on why I won't run the creatures you are playing...they are only good when there is a critical mass or density of creatures on board. Captivating Vampire really shines when you have at least another couple or more creatures already on the board, and you can forget about ever activating his second ability in a typical Modern game. In contrast, Vampire Nocturnus works great even when he's the only creature on board (a common sight after you have grinded the opponent out with discard and removal a la Jund). Vampire Lacerator is only good if played Turn 1 and even then it gets outclassed very quickly and then becomes a liability (Tom Ross tried the card in a very early build and called it 'embarrassing'!). Stromkirk Condemned and Indulgent Aristocrat are also only good when you have at least 2 other creatures on board, which I have found to be quite rare in a format full of removal. Furthermore, you cannot afford the card disadvantage, I don't think, if you are not playing Bloodghast.

Lastly, lands - I play 8 fetches to activate Bloodghast and to turn on Revolt for Fatal Push, 4 Mutavault as an honorary Vampire which gets Nocturnus bonus and can be sacrificed to Highborn (man-lands are traditionally used for getting in damage when both players are topdecking after a war of attrition - think Jund again), 4 Urborg, Tomb of Yawgmoth so you can produce black mana with Mutavault and fetchlands (you'd want to save fetches for Revolt Fatal Push and explosive Bloodghast turns), and 7 basic Swamps.

My sideboard includes a little bit of everything, Collective Brutality against Burn/Infect, Damnation against creature heavy decks, Duress as additional discard against control, Fulminator Mage and Ghost Quarter to kill lands, Nihil Spellbomb, Surgical Extraction and Scarab Feast for graveyard decks, Pithing Needle for various activated abilities, Vampire Hexmage for planeswalkers, Kalitas, Traitor of Ghet for Jund or Abzan mirrors.

Just sharing my own experience playing Vamps in Modern for the longest time.

zephyr_chang how do I go about upvoting the comment you gave? ;)

I really appreciate all the time and effort you put into giving me advice and criticism. It was incredibly helpful and thorough.

I checked online about the the mono-black vampire builds that Tom Ross made and he literally said he was embarrassed about Pulse Tracker and Vampire Lacerator! I had never seen that discussion before so thank you for referring me to it!

To get straight to the point, I took your advice and rearranged the build. I substituted Viscera Seer in for Vampire Lacerator. I took out Indulgent Aristocrat and Captivating Vampire for Bloodghast and 2 more Sign in Blood. I hope this helps the build to be more consistent and more competitive. I wish Bloodghast was cheaper, but there is a reason it is expensive, being as good as it is.

As for the lands, I'm going to leave it the way it is for now, with the next big investment being Marsh Flats since I am a Mardu player through and through.

Lastly, I took out 2 Stromkirk Condemned for 2 Victim of Night for extra removal.

All in all, and everything considered, what do you think of the build? Is there anything else you would suggest for the sideboard? Thank you again for the dedicated response!