Effect
When this card inflicts battle damage to your opponent: You can Special Summon 1 Level 4 or lower "Atlantean" Sea Serpent monster from your Deck, except "Atlantean Marksman". If this card is sent to the GY to activate a WATER monster's effect: Target 1 Set card your opponent controls; destroy that target.
The monster effect "When this card inflicts battle damage to your opponent's Life Points: You can Special Summon 1 Level 4 or lower Sea Serpent-Type 'Atlantean' monster from your Deck, except 'Atlantean Marksman'" is a Trigger Effect. (This effect does not target.)
The monster effect "You can Special Summon 1 Level 4 or lower Sea Serpent-Type 'Atlantean' monster from your Deck, except 'Atlantean Marksman'" is an optional effect that can be activated after damage calculation when "Atlantean Marksman" itself inflicts battle damage to your opponent.
The monster effect "When this card is sent to the Graveyard to activate a WATER monster's effect: You can target 1 Set card your opponent controls; destroy that target" is a Trigger Effect that activates in the Graveyard. (This effect targets 1 Set card on your opponent's field.)
The monster effect "You can target 1 Set card your opponent controls; destroy that target" is a mandatory effect that activates if "Atlantean Marksman" itself is sent to the Graveyard as a cost to activate a WATER monster's effect. (It also activates during the Damage Step.)
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