- The effect to decrease a monster’s ATK by 1000 does not start a Chain or target. It lasts as long as that monster remains face-up on the field.
- This card’s effect cannot apply multiple times to the same monster. If the same monster battles a “Watt” monster twice, it will only lose 1000 ATK.
- If Wattcastle is negated while it’s on the field, any monsters that lost 1000 ATK will gain it back. If Wattcastle stops being negated, they will lose the 1000 ATK again.