Orzhov Signet and
Talisman of Hierarchy are decent rocks, and
Pillar of Origins might be since you're tribal.
Phyrexian Altar and
Ashnod's Altar allow you to get easy death triggers (to power a large
Exsanguinate, which is a flavorful win for a vampire deck or
Torment of Hailfire, which is merely a win).
Victimize is a fine piece of reanimation, netting a potential death trigger.
Unburial Rites and
Dread Return are interesting reanimation options, as well.
Underworld Dreams is a fun card, but is lackluster without means to ensure opponents are overdrawing, so if you're looking for a card to cut, this is one. Another card that can go is
Sanctum of Stone Fangs and any other shrine you may have hidden in your deck - they are only useful in a critical mass, and this deck doesn't do that.
BW is the color of instant-speed removal, with W often exiling its targets, to boot. I know you are running several pieces of targeted removal (and one sweeper) that require you to sac a creature, and those work with Teysa, but also demand you have a creature in play (the suggestion another poster made about tokens is good option).
Swords to Plowshares,
Path to Exile,
Anguished Unmaking,
Unmake,
Hero's Downfall, and
Vindicate (granted, not an instant) are all good removal in your colors.
Malakir Bloodwitch,
Sanctum Seeker, and
Champion of Dusk are vampires that provide interesting options.
Game on!