whenever one or more vampires you control attack, create a blood token. (it's an artifact with "1, t, discard a card, sacrifice this artifact: draw a card.")
b, t, pay 1 life: create a 1/1 white and black vampire creature token with lifelink.
bb, t, sacrifice glass-cast heart and thirteen blood tokens: each opponent loses 13 life and you gain 13 life.
