Whenever one or more Vampires you control attack, create a Blood token. (It's an artifact with "{1},
, Discard a card, Sacrifice this token: Draw a card.")
,
, Pay 1 life: Create a 1/1 white and black Vampire creature token with lifelink.
,
, Sacrifice this artifact and thirteen Blood tokens: Each opponent loses 13 life and you gain 13 life.
