Atlantean Dragoons

The monster effect "①: As long as this card is in the Monster Zone, your Level 3 or lower Sea Serpent monsters can attack directly" is a Continuous Effect.

The monster effect "①: As long as this card is in the Monster Zone, your Level 3 or lower Sea Serpent monsters can attack directly" is also applied to "Atlantean Dragoons" itself if its Level is 3 or lower due to the effect of "A Legendary Ocean" or similar cards.

The monster effect "②: If this card is sent to the GY to activate the effect of a WATER monster: Activate this effect. Add 1 Sea Serpent-Type monster from your Deck to your hand, except 'Atlantean Dragoons'" is a Trigger Effect that activates in the GY. (This effect does not target.)

The monster effect "Add 1 Sea Serpent-Type monster from your Deck to your hand, except 'Atlantean Dragoons'" is an effect that must be activated when "Atlantean Dragoons" itself is sent to the GY as a cost to activate the effect of a WATER monster. (It also activates during the Damage Step.)