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