Advanced format ruling
Dark Coffin
Card effect (current official text)When this face-down card is destroyed and sent to the Graveyard, your opponent selects and executes 1 of the following effects:
● Discard 1 random card in their hand.
● Select 1 monster on their side of the field and destroy it.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.