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Hello all! I entered my first tournament yesterday (for M13), and I placed in 8th! I'm pretty new to the game (started 5 months ago, with a borrowed deck), I bought my own deck a month ago, and have been adding to it since. I was a Yugioh player, but I think the game has gotten stupid. I can say that I enjoy playing Magic much more! Anyways, I was pretty happy with myself considering it was only tourny #1. 

I ran these cards:

24 Swamp

4 Vampire Nighthawk
3/4 Gatekeeper of Malakir  Started off with three, but switched out to add a fourth
3/4 Bloodghast  Started out with 4, but switched to 3. 
3 Malakir Bloodwitch  (This thing absolutely destroyed a mono white deck)
3 Viscera Seer
2/3 Pulse Tracker (started with three, ended up liking two better)
2 Kalastria Highborn  (didn't get much usage out of them; only pulled like 3 times)
2 Vampire Nocturnus  (2013) (would have used more, but were very pricey)
2 Go For the Throat
2 Blade of the Bloodchief  (such an amazing card when you can sac out Bloodghast each turn)
2  Diabolic Revelation (2013) (Decided to try this card out, ended up getting three. Saved my ass so many times)
1 Disentomb  (2013) (Was only like 50 cents, so I tried it out, ended up keeping it in the deck)
1 Vampire Hexmage  (was really a placeholder, but helped me kill that stupidly OPed new Liliana).
1 Duress
1 Demon's Horn  (bought to try out, and I loved it. I got lucky, I pulled it in 4 matches)
1 Mark of the Vampire  (2013)
1 Dismember  (that I NEVER drew!) 
1 Sorin Markov

Since yesterday, I have decided to remove:
-1 Vampire Hexmage (side board)
-1 Disentomb (I liked it, but one seems useless[/c] (sideboard or removed)
-1 Duress (sideboard)
-1 Demon's Horn (Although it was fun to use, it's not really a card to run in my deck, would use in casual though.) 
-1 Dismember (removed)

And would like to add:
+2 Vampire Nocturnus (haven't decided between three or four yet)
+2 Sign in Blood (a lot of my draws were bad, so I need to add this) 
+1 Bloodghast (obviously a great card) 



Thanks for reading, and I would love opinions and suggestions!  

Why don't you add red? There are so many great red vampires. Falkenrath Marauders, Curse of the Stalked Prey and Rakish Heir just to name a few.But your deck is pretty good already.