Advanced format ruling
Magic Cylinder
Card effect (current official text)When an opponent's monster declares an attack: Target the attacking monster; negate the attack, and if you do, inflict damage to your opponent equal to its ATK.
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.