As always, this is a casual/budget deck, made and played on MTGO. It cost about 9 tickets to build, and the vast majority of that was the playset of Geralf's Messengers. My second choice for that slot (Rendclaw Trow) can be substituted, making the deck worse but reducing the average cost of the deck on MTGO to about 1 ticket. Ultra-budget friendly, potentially. :)

Originally conceived as a Strionic Resonator deck (oh, how I want to break that card...), but ended up becoming another beast entirely.

This deck has the goal of temporarily pumping up one of the vampires before sacrificing it for lethal damage, with Dying Wish, Rite of Consumption, or both; those are your win conditions.

Having 'double creatures' (that become quadruples with Pawn of Ulamog), and the equipment can quickly accelerate you toward the amount of activations you need to go off. Even better, having some but not all of the pieces out can still create a great threat of activation that will either let you get in a few attacks (decreasing the amount of 'activations' (sacrifices to pump for a win condition) you need to go off), or buy you time by discouraging opponents' attacks.

The deck feels fairly robust because there are a lot of ways to 'get there'. Assuming no lifegain and they're at 20 life:

The base amount is 9 activations with 1 win condition, using Vampire Aristocrat. That'll get him to 20/20. That's actually not that hard to achieve, as many of the creatures in the deck can be sacrificed multiple times (and with Pawn, several of the creatures give you 4 activations each!).

Using 2 win conditions (any combination other than two Rites works) cuts it to 4.

Having a blade equipped on your vampire before you go off also cuts it to 4.

And the low CMC of your spells makes a turn 5+ tutor into win wholly possible even if you're missing a combo piece.

The deck obviously has its weaknesses, but I have surprised many opponents with it already, and because of how the deck runs, most have no idea of just how close they are to straight-up losing from 20 until it's too late.