Originally Posted by
Bucky
Okay, easy part first. Curse of Bloodletting should be cut because, by the time you get to 5 mana, they should have less than 10 life left. At that point it's better as Lava Axe. And if you don't want lava axe, you can just cut them.
Skeletal Grimace is horrible against a lot of decks, but maybe reasonable against some of the others. Move it to the sideboard to free up a slot.
The critical part of Duress is it's one of the few things you want to be doing on turn 1. That means you need to come up with 4 more things to do on turn 1. If you want Undying Evil for your vampires, that's fine, but be sure to add stuff you want on turn 1, like more Nobles or even Fume Spitter or (particularly sadistic with Rakish Heir in the deck) Infiltration Lens.
Lastly, you should make some minor adjustments to your mana base. You are trying to curve Markov Blademaster into Bloodline keeper. Unless your lands show up perfectly (2 of each), you will need a nonbasic to do so. A couple of Dragonskull Summits will make a noticeable difference. Also, consider running one Stensia Bloodhall over a spell for extra reach.