Nice deck! I like the concept a lot overall. Just a few thoughts:Why more Zulaport Cutthroats than Blood Artists? I can see the use of having 1 power to swing, but the cutthroat's only hurt your opponent for creatures you control, whereas blood artist applies to all creatures on the field. I'm making the rather large assumption that budget isn't the issue here considering the $750 deck- so I might consider Bloodghast for the build. I know the two black cost is a bit tricky for three color, but his ability to be recycled, swing for two, and then be sacked to an artist is brutal. I agree that grave pact is incredibly effective, but it takes up your entire turn four, where your deck might be able to take the game by then. Maybe as a one-of? Also Vexing Devil is a nasty option. Love the deck!

mtgraphael Thanks for the feedback, I love this deck and have been working on it for a long time. So the ratio of Zulaport Cutthroat and Blood Artist is something I am still playing with. But as of now, there are more Zulas because its the one point of power comes up surprisingly often. I found myself sitting there wishing my Artist could attack with the team a lot more often than I found myself wishing I was getting triggers off their creatures dying too. I think a lot of the reason is because the reason they are good is generally because I am saccing creatures, more than having a lot of trades. We will see with more testing though, its not concrete. Oh, also Zula being human synergizes nicely for an extra damage with Falkenrath Aristocrat.

Bloodghast is something I thought a lot about. I found that while it gives you a lot of value over the longer game, it ultimately feels worse than Bloodsoaked Champion, which took its spot. They both are aggressive creatures, but your ability to machine gun off mid combat with Champion can be so powerful. Especially with Falkenrath because its another human. Its also cheaper to bring back with Liliana, Defiant Necromancer  ^Flip and less harsh on the mana. And a lot of games will end around turn five, which only gives Bloodghast a few chances to come back where as Champion can do it instant speed basically whenever I want.

And I definitely agree on gravepact, I just changed the sideboard a bit to be better against control and combo. I am making it a one of in the sideboard. Against creature decks it becomes pretty ridiculous. It is basically a repeatable and basically one-sided boardwipe, but I do think it is often too expensive for the deck.

Now, Vexing Devil. That sounds pretty fun. Especially if I was running 4 Lili's. That would be some heat. Thanks for your input, this stuff is fun and always ends with he deck improving.