Advanced format ruling
Depth Amulet
Card effect (current official text)When your opponent's monster declares an attack, you can discard 1 card to negate the attack. Destroy this card during your opponent's 3rd End Phase after activation.
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.