Card Errata:Gravekeeper's Assailant

Old Card Lore: You can activate this card's effect only when "Necrovalley" is active on the field. When this card attacks, you can change the battle position of 1 face-up monster on your opponent's side of the field.

New Card Lore: You cannot activate this card's effect unless "Necrovalley" is on the field. When this card declares an attack, you can change the battle position of 1 face-up monster on your opponent's side of the field.