Bloodgift is nice in that it's a 5/4 body as well as phyrexian arena effect, but the mana cost is a tad high I think when running only 20 swamps. I might give it a test run though, and see how it plays. It's a cheaper $ card than PA is which is always a bonus.I had Guul Draz in an early playtest of the deck and it played ok but I dropped in favor of the Nighthawk. While it's nice, and usually is 5/5 after turn 5 or so, I found that lifelink and deathtouch was a better trade off. None-the-less it's a great card.
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I own a Liliana Vess cars that I'm not using. Hence I put her in because I have the card already. I might take her out just because by the time she hits the table her +1 is mostly useless. Her ultimate is sort of nice, but I could probably fit a better card in there.Liliana of the Veil would probably work well in this deck, but she costs too much. I only play casually with friends so I generally don't spend more than a few bucks per card. If I could afford her, I'd probably put 2 of her in. Her -2 would be great to have.
For dual lands, look into the refuge cycle. You can usually get them for $0.25 - $0.50 a piece. They enter tapped, but you do gain a life which is a small bonus. There's also the gates from Ravnica which are even cheaper although they also enter tapped.I would maybe drop Feast of Blood down to 2 copies and substitute with Murder, Doom Blade, or Ultimate Price. I find that when playing against aggressive decks, I sometimes have FoB in hand, but less than 2 vampires rendering and unable to remove threats. I also like Vampire Lacerator because it's a cheapie 2/2 for a single black mana. Downside is that you lose life during upkeep, but it can help you shave off some lives early on against slower decks.