Glass-Cast Heart is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Whenever one or more Vampires you control attack, create a Blood token. (It's an artifact with ",
, Discard a card, Sacrifice this token: Draw a card.")
,
Complete guide
Glass-Cast Heart is a versatile artifact that fuels Vampire-themed decks by generating both resources and board presence. It serves as a continuous source of Blood tokens and can eventually be cashed in for a massive life swing to end the game.
Generating Blood and Vampires
The first ability triggers whenever you declare one or more Vampires as attackers, creating a single Blood token regardless of how many Vampires attacked. You can also manually create 1/1 Vampire tokens by paying one black mana, tapping the Heart, and paying 1 life. These tokens are white and black and feature lifelink, making them excellent for offseting the life cost of their own creation.
The Ultimate Sacrifice
To activate the final ability, you must pay two black mana, tap the Heart, and sacrifice both the Heart itself and exactly thirteen Blood tokens. This is a heavy cost, but the reward is a 26-point life swing across the table. Note that you cannot sacrifice the same Blood token to pay for its own discard-to-draw ability and the Heart's final ability simultaneously.
Common Mistakes
A common point of confusion is how the attack trigger works. If you attack with five Vampires, you only get one Blood token because the ability triggers 'whenever one or more' attack. Additionally, ensure you have the mana and the exact count of thirteen Blood tokens before attempting the final activation, as you cannot substitute other artifacts for the required Blood tokens.
Interaction examples
Arcane SignetWith Arcane Signet on the battlefield, you can tap it for black mana to help pay for Glass-Cast Heart's activated ability. This allows you to start generating 1/1 Vampire tokens as early as turn three, building up your board presence for future attacks.
Vampire
Swiftfoot BootsWhen you use Glass-Cast Heart to create a 1/1 Vampire token, that token normally cannot attack immediately due to summoning sickness. By equipping it with Swiftfoot Boots, the Vampire gains haste, allowing it to attack right away. This attack then triggers the Heart's first ability, granting you a Blood token.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Glass-Cast Heart
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
If an effect refers to a Blood token, it means any artifact token with the subtype Blood, even if it has gained other subtypes.
Card named in this ruling
- #2· Wizards of the Coast
You can't sacrifice a Blood token to pay multiple costs.
Card named in this ruling
- #3· Wizards of the Coast
Some triggered abilities trigger "whenever you sacrifice a Blood token." These abilities trigger regardless of why you sacrificed that Blood token.
Card named in this ruling
Legal formats
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Meta decks with Glass-Cast Heart
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