I would suggest running 24-25 land for this deck, you lack any form of mana acceleration and your curve relies on some decently expensive bombs, I'd suggest cutting some of your more aggro creatures and Stromkirk Captain as it'll be rare for their damage output to really decrease an opponent's clock by much for a demon to finish with and the deck isn't really a vampire tribal deck (and I am aware of what olivia can do to the non vampires in your deck).

It's more like control.

Stromkirk Captain is primarily for deathtouch + first strike combo and also for defense. The goal is to get 4 mana for casting big bad creatures so i added some Sign in Blood .

Thanks for advice.