I have helped my friend work on this deck for many years now. Mono Black Vampire Tribal definitely has built in Sacrifice mechanics. But not as much as the Deck Zombie bombardment or something similar. I have noticed this deck can be a little slow, and you don't have the draw acceleration to be running
aether vial.
Bloodghast is great when you can combo him, but it will not happen as often as you like in the long run. So with that being said I do recommend keeping this deck as a Tribal Vampire (Mono Black Aggro). You have all the good vampires for the most part. Again I will recommend
Blood Artist and now
Smallpox. Having a way to cheat
bloodghast into play by discarding him and using his landfall is hard in Mono Black modern. Even with
smallpox you have to wait till turn 3 to get him into play. My Ideal turn 1, 2, and 3 plays would be: Turn 1-
Swamp Duress Inquisition of kozilek or
thoughtseize. Turn 2-
Smallpox, ditch a
bloodghast. Turn-3 hope you drew into 3 lands by now. Nowa days baltusrade spy is also a viable option for getting late game
bloodghast's into your graveyard. Drunk Cynic had a great point instead of fetches, you can run evolving wild's with
Urborg, Tomb Of Yawgmoth to stack landfalls for a combo late game. The
Blade of the bloodchief i would cut to 2 becuase it is conditional or dependant. Mirri cut to 0 because this deck already has too many 3 drops. Gatekeeper, Captivating V, Nighthawk eat up enough your mana curve. If you like the free draw from
gitaxian probe check out
street wraith. This is a
rough draft of what I personally would do with the mainboard.
https://deckstats.net/decks/10519/319260-mona-black-vampire-tribal?saved=1&lng=en