Card Errata:Gravekeeper's Watcher

Old Card Lore: When your opponent activates a card that includes the effect of making your opponent discard from his/her hand (this does not include the cost of discarding cards), you can activate this card by discarding this card from your hand to the Graveyard. Negate the activation and effect of the card and destroy it.

New Card Lore: When your opponent activates a card that includes an effect whereby your opponent discards from his/her hand send this card from your hand to the Graveyard to negate the activation and effect of the card and destroy it.