If I had a nickel for every time my opponent played this card against me in a game of Standard on Arena , I'd be able to purchase a copy or two of this card
The deck then plays powerful mid- and late-game threats that synergize with your sacrifice outlets including Vito (drain, 4/3 vampire tokens), Queen's Bay Paladin (reanimate), Bringer of the Last Gift (mass reanimate), etc
Theres also likely to be subthemes of both lifegain and sacrifice, maybe with a small touch of stealing stuff too, as converting things is a big part of being a Vampire
21 Phabine, Boss's Confidant Get Those Parley Triggers Going Parley is an underrated mechanic in which each player reveals the top card of their library, causing you to gain different benefits based upon the types of cards revealed
This is the back-up commander most evidently geared towards solving the how can decks stick it out in the endgame problem