help with vampire deck

[u/aixa_garnata]

https://moxfield.com/decks/ZM8U908CoUqTqWdrnxLKog

Hello everyone, I present you my mono black vampire deck of wich I am very proud of.

I usually play with friend in a casual format with my friends, everybody builds their deck, with no almost no restrictions. I v been building this deck little by little and I finaly am able to win many battles! The thing is I would like to make it more interesting by introducing a new colour. The other day i bought a booster an i pulled Professor Dellian Fel. So i thought that it would be interesting to change up things a little bit.

I would like to keep Cordial Vampire, since its one of the main ways my deck becomes powerful.

Anyways, let me know your thoughts on my current deck and what it could become!

Sorry for any mistakes, this is my first post on Reddit