Emilia, Queen of Massacres

Two-Faced, deathtouch, haste
When Emilia enters the battlefield or transforms
into Emilia, Queen of Massacres, you may pay {b/r}{b/r}. If you do, Emilia deals X damage to each opponent and you gain X life, where X is the
number of Vampires you control.
At the beginning of each end step, if you dealt
combat damage to an opponent this turn,
transform Emilia.