Gravekeeper's Assailant

(1) If Necrovalley is on the field when this card declares an attack, you can change the battle position of 1 face-up monster your opponent controls.

• The (1) optional Trigger Effect activates in Start of the Battle Phase - Attack Declaration.
• This effect targets 1 face-up monster your opponent controls.
• If the target is no longer face-up, its battle position is not changed.
• The target can only be changed to face-up Defense Position. This effect does not Set the target.
• Necrovalley only needs to be face-up when this effect activates, not when it resolves.
• VS. Spirit Reaper: When targeted by Assailant, Spirit Reaper is destroyed by its own effect. Then a replay occurs, as the number of attack targets changed before entering the Damage Step. In this case, Gravekeeper’s Assailant can attack again, and can activate its effect again.