Card Errata:Depth Amulet

User Clarifying Errata:

When an opponent's monster declares an attack, you can discard 1 card from your hand to the Graveyard and negate the attack. This card is destroyed during your opponent's 3rd End Phase after activation.

Instead of:

When an opponent's monster declares an attack, you can discard 1 card from your hand to the Graveyard to negate the attack. This card is destroyed during your opponent's 3rd End Phase after activation.

which resulted in the "discard as a cost" or "part of the effect" confusion.