Advanced format ruling
Poison Chain
Card effect (current official text)During the End Phase of your turn, if you did not attack, you can make your opponent send cards equal to the number of face-up "Iron Chain" monsters you control from the top of their Deck to the Graveyard.
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.