Haunt

Haunt is a keyword ability associated with the Orzhov guild from the Guildpact set. 
==Description==
Haunt works by allowing a permanent's "enters the battlefield"-ability (ETB) or spell effect to go off twice. More precisely, it allows a card to be exiled from a graveyard "haunting" a creature, and when that creature dies, a triggered ability of the haunting card is put on the stack and allows a second usage of the card. Haunt appears only on black and/or white cards.
Head designer Mark Rosewater considers haunt a mistake and has no plans to bring it back. The "haunting" status was referenced on the Mystery Booster test card <c>Kaya, Ghost Haunter</c>, showing a wider design space possible if the base mechanic was not so unsuccessful.
Using double-faced card technology, Disturb in Crimson Vow tweaks the Haunt mechanic by having a creature on the front and an Aura with a related ability on the back. A fixed version of Haunt was also considered for the set.
==Rules==
==Rulings==
*If an instant or sorcery spell with haunt is countered, its haunt ability doesn't trigger.
*Instants and sorceries with haunt have the same effect when they're casted as when the haunted creature dies. Creatures with haunt have the same effect when they enter the battlefield as when the haunted creature dies.
*You may haunt any creature on the battlefield, regardless of who controls it.
*The same creature may be haunted by multiple cards.
*The cards that are haunting a creature don't return from the exile when that creature leaves the battlefield.
*If there are no legal targets for the haunt ability, the card with haunt stays in the graveyard rather than being exiled.
*If a card with haunt is removed from the graveyard in response to its haunt ability triggering, the haunt ability will resolve. But since the card can't be exiled, it won't haunt the target creature.
*The same applies for a token creature with haunt or a copy of an instant or sorcery spell with haunt. The haunt ability will trigger and target a creature on the battlefield, but the token or spell copy will have vanished from the graveyard by the time the ability resolves. It can't be exiled and won't haunt the targeted creature.
*If a card that's haunting a creature leaves the exile, due to <c>Pull from Eternity</c>, for example, the haunt effect ends.
*The source of an ability that triggers when a haunted creature dies is the card with haunt in the exile. The ability is controlled by the owner of that card.
*If a creature with haunt controlled by Player A but owned by Player B dies, Player A controls the haunt triggered ability. That player chooses the target for the haunt ability and must exile the card. However, when the haunted creature dies, Player B will control the triggered ability of the card in the exile and will make any choices it requires.
==Examples==
==References==