I like all the suggestions with Pheardemons. I would also like to add Whip of Erebos. It gives all your creatures lifelink and the ability to bring back a game ender like Vampire Nocturnus.

Edit: Also if taking mono-black route, Nykthos, Shrine to Nyx can be great mana ramp.

Yeah i agree he have good ideas, my brother is useing whip of erebos! Its really good actually, but it dosent fit here so much because of the power of the vampires. However bring back vampire nocturnus is a really great idea. I might look into it, thanks for comment!

Pheardemons did a really remarkable job on this, and gave you info on a few different paths this deck could take. If you are interested in a dimir vampires build, then let's see what we can do.

Okay, so there are a few things that I might try, and a few others that I'm going to question that are in your current list. First, I'd like to question how effective AEther Vial and Ashiok, Nightmare Weaver are in your list. I don't think Aether Vial has enough creatures to play to make it worth the inclusion, as you only have 19 at the moment. While dumping your hand is great, an underused Aether Vial is just dead card advantage, so unless you have a lot of tricks with it when flashing in creatures during your opponent's turn, I would take it out in favor of other cards. It also doesn't work well with Gatekeeper of Malakir, as you won't be able to pay the kicker cost if it is played with Aether Vial since you are playing the spell, not casting it. Ashiok, Nightmare Weaver is a truly cool card. Who doesn't want to beat their opponent silly with their own minions? However, I feel like this is a bit unnecessary in this shell. While you are certainly able to cast it and play with it, I feel like it isn't building towards your win condition as quickly as other cards could. Obviously, Ashiok is fun and if you'd prefer to keep it in, by all means, do so. Some other cards I'd like to question are Asylum Visitor and Blood Artist. Don't get me wrong, these cards are great, but I feel like they won't consistently be able to produce the value you are looking for in this shell.

On the other spectrum, I would like to suggest something that I used to use in my old mono black vampires list. I ran 4 Viscera Seers, 4 Bloodghast (pretty expensive at the moment due to dredge :/), and 4 Kalastria Highborns.This creates great synergy, as you can sacrifice you Bloodghasts for free at the end of your opponent's turn to set up your draws and drain life using Kalastria Highborns. When Vampire Nocturnus is on the field, Viscera Seer can allow you to scry until you find a black card to put on top of your library to get the effect. Collective Brutality would also be an excellent inclusion, being able to discard your Bloodghasts so you can get them for free the next time you play a land.

The following deck is a direction I think your deck could head in to have interesting, meaningful card interaction while staying competitive:

22 Creatures: 4 Viscera Seer, 4 Bloodghast, 4 Kalastria Highborn, 3 Gatekeeper of Malakir, 2 Vampire Nighthawk, 3 Vampire Nocturnus, 2 Kalitas, Traitor of Ghet,

15 Noncreatures: 2 Serum Visions, 4 Inquisition of Kozilek, 2 Night's Whisper, 1 Collective Brutality, 1 Slaughter Pact, 3 Countersquall, 2 Feast of Blood,

23 Lands: 2 Ghost Quarter, 1 Oboro, Palace in the Clouds, 4 Drowned Catacomb, 3 Polluted Delta, 2 Watery Grave, 10 Swamp, 1 Island.

This list may not be too insane, but I think that it has a lot of the right choices, and with refining, could prove to be great. If you have any questions on why I included any of the card choices in that list, feel free to ask!

The sideboard for your list can either be a universal sideboard or a sideboard more refined for your meta. If you let us know what decks you face often at FNMs or other events, we can better help you craft a sideboard.

I agree with ther vial, i tryed it and many times it's a dead card as you said. So i am going to include it inn my ally deck with 28 creatures. And Ashiok is great everytime, but also sometimes a dead card. When i play agaisnt burn. The meta we are playing inn is Tier 1-2. Infect, jund and dregde i have been upp agaisnt. I have build the deck you suggested inn other deck on my profile. The thing is, it's a bit slow? Oboro and bloodghast can be a really good combo, but with only 1 land, i need some luck. And i see u dropped bloodline keeper. Hmm well i'l playtest and see how it goes. So far the deck i made here, almost winn at turn 7 everytime, with 3-4 creature removal spells. So i dont lose too rush. But i would defently lose agaisnt your human deck. Inn the sideboard i need to be ready for almost anything inn modern meta. Thanks so much for taking time too look at my deck.

And sorry for my bad english.

No worries. I agree with you that you would need something strong to pull ahead against aggro decks, so maybe you could add a few more removal spells and 1-2 small board wipes (like Drown in Sorrow) in the sideboard. The Bile Blight that you have in your current sideboard would be an ideal inclusion for game 2 against a deck like mine. If you are having trouble with infect, the most widely used solution is Spellskite which as you may know already, can really throw an infect player off of their game. This could also be good against burn as a blocker and would allow you to reduce the damage dealt to your face or other creatures. Against Jund bringing in a 4th Gatekeeper of Malakir from your sideboard along with 1-2 Dismembers would be great, giving you the removal and tempo necessary to get ahead. Dredge could be problematic since potential hate cards that you'd bring in would interfere with your own Blood Ghasts, but Surgical Extraction could do some real work for you. My deck is just a rough draft of what I picture your deck could be like, and would certainly need some level of refining to perfect. The sideboard should also cover the Affinity/Robots matchup, so I'd suggest Night of Souls' Betrayal as a 1 of in the sideboard. While this looks bad for you, it absolutely slaughters the affinity matchup, almost always totally shutting them down. You could also run Engineered Explosives or Chalice of the Void in the sideboard against Affinity (although these are fairly expensive, so you could probably get away with playing cards like Shrivel instead). Ghost Quarters should already help you a lot in this matchup anyway though, and you have fliers so that they have to work for their damage.

Also, if you can find room for Bloodline Keeper  ^Flip without making the deck too slow, go for it. The reason I didn't add Bloodline Keeper  ^Flip is because it is very susceptible to removal for a 4 drop and it doesn't affect the board on the turn that it comes into play. Of course if it has been working for you, don't let that stop you from going with what's been working!

Ya spellskite is defently a card im thinking of inn the sideboard, and drown inn sorrow i have used before! Worked really well. Better than bale blight, almost always one kill. My relic have been good agaisnt dregde, they just cant get rid off it. And when im lucky enought too have 2, they give upp. Also works well agaisnt jund because of tarymgrof cant use graveyard, as well as the ozze. And the thing about bloodline keeper is hes transform ability, its way better than vampire nocturnus soo far. And give him 1 turn a token and bam transform, attack for around 11-16 on turn 6-7. Game wonn. But all your suggestions are on other deck i made, and it also winns on turn 6-7. Well it's hard. I have been working on the deck for a really long time, and it was best when i had like 5-6 removals and 4 gatekeeper of malakir inn main. Because inquistion is good, but blood artist loses hes good ability. What do you think of what i said? Only been playing for a year, so i have much to learn.

Vial have helped agaisnt controll deck's because it works like a mutavault, they want too stall. But can't counter vial and i can flash out vampire nighthawk on turn 4, it's slow. But most meta winn at turn 5. So i barely need 1 turn to change the game, if i got the right card's.

It sort of didn't hit me till now, but instead of AEther Vial against control, why not run Cavern of Souls a Tribal Creature staple against counter magic

Indeed a good card, but it cant help me get our creatures for free. But i might change it out, since ther vial is sometimes a dead card. Shuld i take 3 more vampires, like 1 more nighthawk and 2 kalastria highborn? Or 2 more removals like geth's verdict times 3.

This is the other deck that Whisperingblade and Pheardemons have suggested.

http://tappedout.net/mtg-decks/vampires-can-be-a-nightmare/

Cheers!

One card to sideboard against dredge that I was reminded of during EDH today is Bojuka Bog. Very solid, and you might even be able to get away with running 1 in the main (although I don't necessarily recommend it, but it is an option instead of or in addition to being a sideboard card).

Wow! Didnt know about that land! Can just have it inn sideboard and change it for a swamp + 3 relic = Dredge might have a problem

Also Tormod crypt is nice when play agaisnt Dredge, have 4 of them inn the Ally deck.

You need Bloodghast, Mana Leak, Remand, Serum Visions, possibly Ancestral Vision, and Murderous Cut

What do you thing is good too take out for it, im open for suggestions?

Hey!

May all the people who have commented on the deck, look at it again? I have made some huge change and gotten many good idea's from you.

Do you have some more advice, i might add snapcaster mage, if this benefits this deck?

Any cards you mean that i really dont need?

Ashiok is now gone. Best Regards Keyb

Hey, your list looks pretty good, well done! When looking at your curve, it appears that the only turn 1 plays are your Inquisition of Kozileks, so I'd recommend adding a few 1 drops. What I would do is cut 1 Blood Artist, and 1 Liliana, Heretical Healer  ^Flip (3 isn't ideal with the legendary rule) for 2 Thoughtseize. Thoughtseize will help you against combo decks and make for extra turn 1 plays, something very useful for keeping the pace with aggressive decks even with the loss of 2 life. Next, I'd like to recommend that you swap out 2 of your Sign in Blood for 2 Night's Whisper, as Night's Whisper is easier to cast (although note that you can't target your opponent with Night's Whisper to deal damage like Sign in Blood could, so if that matters a lot to you, ignore this suggestion). I also think that the new card coming out in Aether Revolt, Fatal Push, would do wonders here if you could manage to get 3 copies. If you could, I'd add the 3 Fatal Push and take out 1 Sign in Blood and 2 Victim of Night. If you have your doubts about how to trigger Fatal Push, cracking a fetch to get a swamp and then using Fatal Push is the easiest way to reach the revolt trigger. Anyway, good luck with the brew!

Wow, thanks so much for awesome suggestions whispering blade, i will make the change right away. I forgot about the legendary rule when i added Liliana. About Night's whisper for Sib, il stay with sign in blood for the extra damage, because mana curve have never been an isue. Ya fatal push look's awesome, next week i have a torm coming upp and then i will try your ideas! Cheers!