Obszedat is still better than Lord of the Void, even if you cook him in your hand until turn 5. Lord is a little Esper-ish for my liking. And with the release of Dragon's Maze, the Tithe Drinker (2/1 Vampire, extort. Cost B,W) is a great replacement for Syndic of Tithes IF you feel like running a few more plains, or the Innistrad B/W land which I can never remember the name of.But great use of the guildmage. Never though of using it with Exquisite for a (possible) 5th turn win.And if you're bitching about using Orzhov because you have to keep in mind all your mana, switch to another guild. Orzhov is too op for your problems.
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Basically a troll deck.
....Gravecrawler...
Xadrith is a nice card, but for vamps and lifelink, it can take the back seat. Try going more vampy if you are going to do that. Captivating vampire is a good option if you want a token battle with your bloodline...
Exactly as before, get some dual land (Blood Crypt and Dragonskull Summit), lose most of the singles you have, and replace with 4x of some. Should have 4x-ish of Stromkirk Captains, and some Stromkirk Nobles are a strong 1 drop. Also, try to get some Zendikar vamps, and especially Nocturnas. Also, your Fengraf and Increasing Vengence are wasting space (among most of the sorcery/instants).