- This is a Quick Effect. You Chain it directly to the opponent's effect that would inflict damage. Removing this card from play is a cost.
- You cannot Chain the effect of Damage Eater to the activation of Wave-Motion Cannon, but you CAN Chain it to the activation of the effect of Wave-Motion Cannon that inflicts damage.
- You cannot Chain Damage Eater's effect to a card or effect like Changing Destiny or The Paths of Destiny because it's uncertain whether or not it will inflict damage.
- The effect of "Damage Eater" can only be activated directly in Chain to an effect activated by the opponent which inflicts damage.