Hibernation Chamber

{b}{b},{t}, Sacrifice a Human: Hibernation
Chamber becomes a 4/4 black Vampire creature
with flying. It gains "When this creature dies,
return Hibernation Chamber to the battlefield
tapped under its owner's control."

The most cunning vampires own Hibernation
Chambers. The biggest problem, however is trusting
that those without will make the sacrifice required to
bring them back from within.