Glass-Cast Heart

The number thirteen is the whole design, doing double duty as flavor and as a hard win condition. Vampire decks generate Blood tokens as a matter of course, and this artifact both feeds that stream (a token whenever your Vampires declare an attack) and converts it: hoard thirteen Blood plus the artifact itself, tap it, and drain each opponent for thirteen while gaining thirteen back. That final activation is a countdown, not an incremental engine, and that is the tension worth noting. Most aristocrat payoffs bleed a point or two at a time and ask you to survive the accumulation; this one banks everything into a single detonation and asks you to protect a fragile artifact while you stockpile. The middle ability is the connective tissue, a Vampire token maker on a repeatable, life-paying activation, so the card can build its own attacking board and keep the Blood spigot flowing even when the rest of the deck stalls. Thirteen is a large enough reservoir that it often functions as a threat you never actually cash in, a sword hanging over the table that forces opponents to find artifact removal before you find the last two Blood tokens. It is a rare tribal payoff that reads as horror-movie flavor first (a cursed heart tallying its due) and resolves into a demanding but genuinely clean alternate route to closing out a game.