Blood Rave

All vampires you control get +2/+0, and have First strike and Lifelink until end of turn.
Massacre- At the end of your combat phase, if three or more creatures died this combat, put X +1/+1 counters on all vampires you control. X is equal to the number of creatures that died this turn.
"At some point no one was sure who's blood they were covered in or cared. It was glorious!"-Olivia Voldaren