f4113nx

Nice deck, Ima try this in standard.

Far to many 1 ofs. Consolidate your creatures & spells choosing what you want the most and then subbing the rest into sideboard upto 15 cards total.

Basically you have too much going on. I can understand if you are building from the collection you have but do your best to reduce the different creatures and/or spells and put in more of the stronger creatures & spells spread out over the mana curve.

Fate Reforged & Khans of Tarkier are both now out of standard. MTGVault has yet to update this.

Could potentially use Evolving wilds, just another way to grab the mana you need more specially with all the Double Black and Double White you need for this deck.

The biggest thing I feel your deck is lacking is card draw as a Midrange deck. Read the Bones would be the best option here.

If you have declaration in stone, I feel that it would be wise to replace your Silkwraps with them.

As for sideboard options heres a short list.
Surge of Righteousness
Duress
Transgress the Mind

I just don't see this working... Not enough land first of all when 9 of your cards take 6 mana & 3 takes 7mana. In order to make up for it I would get rid of the Unholy Strengths and get 4 more swamps in there. Thats a mim in order for this deck to be truthfully decent in my opinion.

I suggest 2 or 3 Captivating Vampires, 2 or 3 Bloodghasts, 1 malikir Bloodwitch in the main board and 1 or 2 in the sideboard. Raise sign in blood to 4 Trade out Diabolic Tutor... Also trade out the butcher of malikir, although his flavor text is incredible, he sucks as a card outside of the right decks and even in the right decks he kind of sucks.

Also, if your going to have non-basic black land. I suggest bojuka bog...

With most of your creatures over 3 mana, I highly Suggest first off, that you add a mim of 4 more lands. Secondly a great addition to this deck would be Consume the Meek for mass removal when you need it...

Heres what I suggest. Get rid of Viscera Seer, 1 Bloodghast, and at least a couple Kalastria Highborns. Put in some Arrogant Bloodlords, Grim Discovery would be a good choice for this deck. A couple Sign in Bloods wouldn't hurt. Guul Draz Vampire is a good one drod as well.

I suggest adding White Knight, 2/2 First Strike Pro-Black for WW. Would be a great addition to any white weenie

Allies are quite beast and they are very cheap to boot. This deck looks like it could really kick some @$$.

Take 2 Bloodthrones out, 1 Blade of The Bloodchief, Take out 1 Butcher mim, 2 if your willing. Take out the doom blades and switch them with Gatekeeper of Malakir. These are my suggestions.

It looks like it could play really strong. Would like to see it in action. Not so interested in playing against it. ^^

PS: I have 3 different versions of vampire decks. You could take a look at those to get some ideas if you like.

I suggest you buy the M11 Vampire Intro pack. It has Captivating vampire in it and that should help greatly. Once you start getting older cards like Worldwake & zendikar, Add creatures like pulse tracker & bloodghast. Also, Get rid of bloodrite invoker and a blood seeker or 2. Replace them with swamps. That should get you started in the right direction.

If you mean Brave the Elements would protect against Pyroclasm. Your incorrect. I believe that Ajani's Mantra is more there for powering up Ajani's Pridemate more than for pure lifegain...

As for Pacisfism, Journey to Nowhere would be a far more useful choice...

Path to Exile

Trade the Kalastrias for something better like another captivating.

^^ 101% fine by me :D

I suggest adding in a couple Luminarch Ascensions in order to get blockers/attackers out. Also like Lord said, Fight to the death is without blockers, attackers.