Curse

Curse is an enchantment type which appears alongside Aura. All Curses enchant players and provide a detrimental effect to that player.

Description
There aren't any special rules for Curses—they follow all the normal rules for Auras that enchant players—but there are some cards that refer to the Curse subtype by name.

The subtype was introduced with Innistrad, though the ability to enchant players is older with Psychic Possession from Dissension (though it reads "enchant opponent"), Paradox Haze from Time Spiral and Wheel of Sun and Moon from Shadowmoor. After the Innistrad block, Curses reappeared in Commander 2013. It included the first green Curse.

Curses received mixed reactions among the players. R&D chose not to reuse them in large numbers in Shadows over Innistrad. However, they made a quick reappearance in the Amonkhet block and Commander 2017 and are now considered to be deciduous.

The design of Curses was inspired by Volrath’s Motion Sensor from Unglued.

Rules
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Rulings

 * A Curse spell targets the player it will enchant like any other Aura spell, and a Curse stays on the battlefield like any other Aura.
 * If the enchanted player gains protection from the Curse's color (or any other characteristic the Curse has), the Curse will be put into its owner's graveyard.
 * Each of the Curses can be attached to any player, including the player who cast the Curse.
 * Curse is an enchantment type, not a creature type.

White

 * Curse of Exhaustion (DKA)
 * Curse of the Forsaken (C13)
 * Curse of Vitality (C17)
 * Overwhelming Splendor (HOU)

Blue

 * Curse of the Bloody Tome</c> (ISD)
 * Curse of Echoes</c> (DKA)
 * Curse of Inertia</c> (C13)
 * Curse of Verbosity</c> (C17)
 * Fraying Sanity</c> (HOU)

Black

 * Cruel Reality</c> (AKH)
 * Curse of Death's Hold</c> (ISD)
 * Curse of Disturbance</c> (C17)
 * Curse of Fool's Wisdom</c> (C19)
 * Curse of Misfortunes</c> (DKA)
 * Curse of Oblivion</c> (ISD)
 * Curse of Shallow Graves</c> (C13)
 * Curse of Thirst</c> (DKA)
 * Curse of Vengeance</c> (C16)
 * Infectious Curse</c> (SOI)
 * Torment of Scarabs</c> (HOU)
 * <c>Trespasser’s Curse</c> (AKH)

Red

 * <c>Curse of Bloodletting</c> (DKA)
 * <c>Curse of Chaos</c> (C13)
 * <c>Curse of Opulence</c> (C17)
 * <c>Curse of Stalked Prey</c> (ISD)
 * <c>Curse of the Nightly Hunt</c> (ISD)
 * <c>Curse of the Pierced Heart</c> (ISD)

Green

 * <c>Curse of Bounty</c> (C17)
 * <c>Curse of Predation</c> (C13)

Black

 * <c>Bitterheart Witch</c> (ISD)
 * <c>Curse of Thirst</c> (DKA)

Artifact

 * <c>Witchbane Orb</c> (ISD)

Auras

 * <c>Curse Artifact</c>
 * <c>Curse of Chains</c>
 * <c>Exotic Curse</c>
 * <c>Ironclaw Curse</c>
 * <c>Nettling Curse</c>
 * <c>Teferi's Curse</c>
 * <c>Volrath's Curse</c>

Enchantments

 * <c>Curse of Marit Lage</c>
 * <c>Curse of Wizardry</c>
 * <c>Thelon's Curse</c>
 * <c>Curse of the Fire Penguin</c>

Sorceries

 * <c>Baki's Curse</c>
 * <c>Curse of the Cabal</c>
 * <c>Curse of the Swine</c>

Trivia

 * At one point, curse counters were considered for the design Champions of Kamigawa.
 * The Mystery Booster test card <c>Celestine Cave Witch</c> uses the word "curse" as a keyword action that allows the player to create Curse enchantment tokens.