Effect
When this card resolves: Banish 1 WATER monster from your hand, Graveyard, or face-up on your field. Then, when this face-up card on the field is destroyed: Special Summon that banished monster to your side of the field.
The effect "When this card is activated: Target 1 WATER monster in your hand, field, or GY; banish it" is the effect processing that occurs when the card "A Legendary Ocean" is activated. (This does not target.)
When the card "A Legendary Ocean" is activated, at the time of its effect processing, you choose 1 WATER monster from your hand, your GY, or face-up on your field and banish it. (You cannot choose a monster in face-down Defense Position on your field.)
If there are no WATER monsters in your hand, your GY, or face-up on your field, you cannot activate the card "A Legendary Ocean."
The effect "When this face-up card on the field is destroyed: Special Summon that banished monster to your field" is an effect that starts a Chain. (This does not target. It can also be activated during the Damage Step.)
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