Kalastria Bloodoath

Tap any number of vampire creatures you control. Each opponent loses 2 life and sacrifices a permanent for each vampire tapped this way. You gain life equal to the life lost this way. Draw two cards at the beginning of the next end step.
The Bloodoath is both elegant and gory. Many sacrifices are made, but many vampires profit from the ceremony. Beware those who partake in it's rituals.