Dark Coffin

 This card is a reference to graverobbing in Egyptian stories, where the thieves anger the spirits of the Pharaohs for trying to steal their treasure and exact revenge, hence this card’s effect punishing the opponent for recklessly destroying it.

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OCG Rulings

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This card's effect can activate if it is destroyed during the Damage Step.: When a face-down "Statue of the Wicked" is destroyed in the Damage Step, does its effect activate?

If this card is destroyed while it was Set and sent to the Graveyard, then its effect starts a Chain Link.: Trap Card > Dark Coffin

The opponent selects one of the two effects when the effect resolves.

It isn't possible to activate

Previously Official Rulings

This card is only activated if sent from the field to the Graveyard. There is no way to activate this card while it is Set on the field.

The effect of "Dark Coffin" is activated in the Graveyard, so its effect is activated even if "Jinzo" is on the field, because "Jinzo" only applies to Trap Cards and Trap Card effects on the field. Also, cards like "Seven Tools of the Bandit" cannot be used against "Dark Coffin".

"Dark Coffin" activates its effect even if it is destroyed on the same turn it was Set.

If "Banisher of the Light" is in play, then "Dark Coffin" does not activate its effect when destroyed, because it is not sent to the Graveyard.

You cannot choose an effect you cannot fulfill, so if you have no cards in your hand, you cannot choose to discard for "Dark Coffin".

"Dark Coffin" activates its effect even if you destroy your own "Dark Coffin".

Mentions in Other Rulings

Gemini Imps: When your opponent activates the effect of “Dark Coffin” or “Helpoemer”, you can Chain “Gemini Imps” to negate the effect. However, because the “Dark Coffin” or “Helpoemer” is in the Graveyard, it cannot be destroyed so you will not draw a card for “Gemini Imps”.

Magical Hats: If "Statue of the Wicked" or "Dark Coffin" are selected and they are destroyed while face-down, their effects activate. If they are flipped by an attack and destroyed, their effects do not activate.

Ojamagic:" Since a Spell Speed 1 effect cannot be chained to a Spell Speed 2 effect, and "Ojamagic" is a Normal Spell Card, if "Ojamagic" is sent to the Graveyard simultaneously with a Spell Speed 2 card that activates in the Graveyard, like"Dark Coffin", then "Ojamagic" is the first chain link, and the Trap Cards will be the second and third chain links.