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. {B}{B}, {T}, Sacrifice Glass-Cast Heart and thirteen Blood tokens: Each opponent loses 13 life and you gain 13 life.
![Glass-Cast Heart (Extended Art) [Innistrad: Crimson Vow Commander]](http://tothetablebgc.myshopify.com/cdn/shop/files/3dd488b6-40c0-47c4-9bed-c071f7b2f508.png?v=1776621598&width=1445)
