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Spontaneous Mutation

Eldritch Moon — common

Enchantment — Aura

Spontaneous Mutation rulings:

2020-11-10: The value of X will constantly update as the number of cards in your graveyard changes.

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3.02/10

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Fear of Death

Enchantment — Aura

Enchant creature
When Fear of Death enters the battlefield, mill two cards. (Put the top two cards of your library into your graveyard.)
Enchanted creature gets -X/-0, where X is the number of cards in your graveyard.

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Festive Funeral

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Target creature gets -X/-X until end of turn, where X is the number of cards in your graveyard.

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Liliana, Waker of the Dead

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+1: Each player discards a card. Each opponent who can't loses 3 life.
?3: Target creature gets -X/-X until end of turn, where X is the number of cards in your graveyard.
?7: You get an emblem with "At the beginning of combat on your turn, put target creature card from a graveyard onto the battlefield under your control. It gains haste."

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Hearth Elemental // Stoke Genius

Creature — Elemental // Sorcery — Adventure (4/5)

This spell costs less to cast, where X is the number of cards in your graveyard that are instant cards, sorcery cards, and/or have an Adventure.

Stoke Genius

Discard your hand, then draw two cards. (Then exile this card. You may cast the creature later from exile.)

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All-Seeing Arbiter

Creature — Avatar (5/4)

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Whenever All-Seeing Arbiter enters the battlefield or attacks, draw two cards, then discard a card.
Whenever you discard a card, target creature an opponent controls gets -X/-0 until your next turn, where X is the number of different mana values among cards in your graveyard.

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Armix, Filigree Thrasher

Legendary Artifact Creature — Golem (3/2)

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Chupacabra Echo

Creature — Beast Horror Spirit (3/2)

Fathomless descent — When Chupacabra Echo enters the battlefield, target creature an opponent controls gets -X/-X until end of turn, where X is the number of permanent cards in your graveyard.

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Necrotic Wound

Instant

Undergrowth — Target creature gets -X/-X until end of turn, where X is the number of creature cards in your graveyard. If that creature would die this turn, exile it instead.

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Song of Stupefaction

Enchantment — Aura

Enchant creature or Vehicle
When Song of Stupefaction enters the battlefield, you may mill two cards. (You may put the top two cards of your library into your graveyard.)
Fathomless descent — Enchanted permanent gets -X/-0, where X is the number of permanent cards in your graveyard.

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Death's Approach

Enchantment — Aura

Enchant creature
Enchanted creature gets -X/-X, where X is the number of creature cards in its controller's graveyard.

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Disturbing Conversion

Enchantment — Aura

Flash
Enchant creature
When Disturbing Conversion enters the battlefield, each player mills two cards.
Enchanted creature gets -X/-0, where X is the number of cards in its controller's graveyard.

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Guest List

Artifact — Contraption

Whenever you crank Guest List, target creature gets -X/-X until end of turn, where X is the number of creature cards in its controller's graveyard.

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Liliana, Untouched by Death

Legendary Planeswalker — Liliana

+1: Mill three cards. If at least one Zombie card is milled this way, each opponent loses 2 life and you gain 2 life.
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Painbringer

Creature — Human Minion (1/1)

, Exile any number of cards from your graveyard: Target creature gets -X/-X until end of turn, where X is the number of cards exiled this way.

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Specter of Mortality

Creature — Specter (3/3)

Flying
When Specter of Mortality enters the battlefield, you may exile one or more creature cards from your graveyard. When you do, each other creature gets -X/-X until end of turn, where X is the number of cards exiled this way.

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