Seems you build the decks the way I do, cheers and +1

I have a similar vampire deck! Great stuff!

Forgot to suggest Exquisite Blood, great pairing with Sanguine Bond.

Yeah I'd thought about putting in Exquisite Blood, but ultimately I opted to just go the Sanguine Bond route. It allows me to play a bit more conservatively while still damaging the opponent, since Lifelink works even if I don't damage the opponent. I haven't tested this deck out too much, but I'll keep Exquisite Blood in the maybeboard just in case I want to change it up.

Looks like a fun deck!

Am I reading it right that Exquisite Blood paired with Sanguine Blood creates a loop of endless damage to him and enless lifegain to you?

Example: You have both cards on the battlefield. You deal one damage to him somehow. Exquisite Blood triggers, gaining you one life. The lifegain triggers Sanguine Blood, making your opponent lose one life, triggering Exquisite Blood again... and on and on...

If so, that's a pretty sweet combo, even if Exquisite Blood is a little pricey.

What about Divine Offering instead of Mortify? One less mana and has lifegain.