Just testing some ideas. This deck was created in a casual day for a casual meating, when we was going to play a two-headed giant match. Abusing from the magnificent words "each oponent", I thinked in draining life with some allies plus Kalastria Healer, and then added some other drain life sinergy like Drana's Emissary, Blood Artist and some exhort from Blind Obedience.
The real show starts when Cliffhaven Vampire come to the battlefield, and the aditional life lost each time we win life join the party. That's why I added too the Vampire Cutthroat with the skulk and lifelink is an almost 100% triggerer, just like Vampire Envoy (this one is ally too, so is a double win).
Eerie Interlude is the master piece from the deck, in a late game, with some allies vampires in game, casting this spell, will make them all enter the battlefield again, triggering Kalastria Healerand Cliffhaven Vampire again, hoppefully is a GG :), anyway, if there isn't any of these in play, we can still save our creatures from masive removal.
I put Bloodbond Vampire just to have a big creature, just in case, with Kalastria Healer in game, I get a 4/4, wich will grow realy fast, one way or another.
If anyone can help me immproving this deck, i will be glad to listen any feedback!