① If this card inflicts battle damage to your opponent:
You can Special Summon 1 Level 4 or lower "Atlantean" Sea Serpent from your Deck (except "Atlantean Marksman").
② If this card is sent to the GY to pay the cost of a WATER monster's effect:
Target 1 Set card your opponent controls; destroy that target.
● If this card is not in the GY before this effect activates, it does not activate.
EG: This card is discarded to activate "Mermail Abysspike", and "D.D. Crow" is chained. This card does not activate.