A good land to run in this deck is mutavault because it will combo with Captivating Vampires.
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Just a suggestion you might want to cut the deck down to 60 cards.
I still don't think Murmrming Bosk should be in this deck due to the cards that you have that already eat away at your life total. Not adding a big creature is fine.
A good land for this deck would Mutavault over Murmrming Bosk because it works well with Death Baron because it gets the +1/+1 and deathtouch from him. You might also want to consider putting in a big creature in for the later game because the highest mana cost creature in your deck is only 3.
Thanks for the advice, I'll try out Engulfing Slagwurm but llanowar elves are in there over Birds of Paradise to make Wren's Run Vanquisher better. I'll also try out putting in a couple more Garruks and I will put the Vines of Vastwood in the sideboard
A good card for this deck might be coat of arms because all of your creatures are the same type.
Its a good card but not for this deck because it would through the mana curve off, since I think wurmcoil is a better creature so i have nothing else to replace it with.
This looks like a vampire combo deck so a good combo card with bloodghast is viscera seer. Viscera seer also helps to make sure you have a black card and not a artifact on the top of the deck for vampire Nocturnus
Since all of your creatures are the same type coat of arms might be a card worth considering.
Dragonskull summit is a great dual land for a deck like yous i would put it in, it would help manage your mana.
Nice deck but the mana curve doesn't really work. So you should take out some creatures and put in dark ritual. It should make the deck faster and more effective.
If the goal is to get Demon of Death's Gate out i wouldn't suggest having Viscera Seer in the deck because i don't think you want to sacrifice any creatures.