Lands

 

Swamp x 19

Urborg x 1

 

 

Creatures

 

Nightmare x 1

Bog Raiders x 2

Sengir Vampire x 3

Bog Wraith x 3

Filth x 1

 

 

Spells/Enchantments/etc.

 

Soul Exchange x 3

Terror x 4

Demonic Tutor x 4

Drain Life x 2

Animate Dead x 2

Buried Alive x 2

Evil Presence x 2

Bad Moon x 1

Dark Ritual x 4

Breeding Pit x 1

Deathgrip x 2

Haunting Wind x 2

Gloom x 1

Gate of Phyrexia x 1

 

Now, for your creatures.  If I to infer from the E-mail's suject that this deck is based on Nightmare and creatures with Swampwalk, then you've done your job well.  Only one Nightmare is a bit distressing, but I noticed you have Buried Alive to tutor it and Filth into your graveyard, then reanimate it with Animate Dead or Soul Exchange.  I'd prefer a few more Nightmares if you can manage it, but they might be expensive.  Your Bog creatures are fine, but I'm not sold on Sengir Vampire.  The "vampire" ability has long been criticized for how difficult it is to trigger reliably without a lot of combat tricks, and since your strategy seems to make your creatures unblockale, you may want something a little more tailor-made for not getting blocked.  The first thing that comes to mind is Avatar of Discord.  Not only is its power-to-mana-cost ratio enviable, it gives you a way to discard that Filth if need be.  It deals more damage per swing than Sengir, and costs less.  Seems pretty simple.