Some of my thoughts and updates to reflect changes I've made.
Ixalan was full of new vampires, but many of the interesting ones were sadly white or black/white. We did get one huge boost though, in the form of Dusk Legion Zealot. I figure if elves use Elvish Visionary at 4x, Zealot belongs at a 4 of as well.
Gifted Aetherborn is a really solid card in a lot of matchups. It can trade with Tarmogoyf thanks to deathtouch, and bring you back into the game against burn or other life-total pressuring decks, thanks to lifelink. All this stapled to a 2/3 body that can easily come out on turn two thanks to our mono-colored nature. Other lists have it at 2-3x, but I've bumped it up to 4x.
I've ended up cutting Kalastria Highborn and Indulgent Aristocrat. Their abilities are undeniably powerful, but in practice I have rarely if ever had the mana open to use them when it matters. I've swapped in 4x Vampire Cutthroat as a 1 drop, and 3x Stromkirk Condemned as a 2 drop. These also offer some flexibility, without requiring the mana.
