Forgotten Temple of the Deep

 This temple seems to be a destroyed, semi-surfaced, version of A Legendary Ocean or a part of Lemuria, the Forgotten City.

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Abyssal Kingshark and 7 Colored Fish appear in this card's artwork.

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This card's second effect might involve hiding the removed monster underwater, similar to what Mako Tsunami did in the anime.

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TCG Rulings

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You can activate the effect to remove a monster from play on either player's turn. It targets that monster. Special Summoning the monster does not target.: Absolute Powerforce - Card Rulings (Version 1.0)

If you take control of your opponent's monster and remove it from play, it returns to your side of the field during your End Phase.: Absolute Powerforce - Card Rulings (Version 1.0)

The field is not treated as "Umi" while this card is active.: Absolute Powerforce - Card Rulings (Version 1.0)

"Royal Decree" will negate the effect to treat this card's name as "Umi.": Absolute Powerforce - Card Rulings (Version 1.0)

The effect to remove a monster from play is Spell Speed 2 and can be activated during either player's turn. It starts a Chain.: Absolute Powerforce - Card Rulings (Version 1.0)

If you remove 1 monster from play on your opponent's turn and another during your turn, both will be Special Summoned during the End Phase. They are Special Summoned at the same time, so if you only have 1 open Monster Card Zone you choose 1 monster to Special Summon and the other goes to the Graveyard.: Absolute Powerforce - Card Rulings (Version 1.0)

The effect to Special Summon starts a Chain.: Absolute Powerforce - Card Rulings (Version 1.0)

If you control this card and "A Legendary Ocean" you can send either to the Graveyard to activate the effect of "Codarus.": Absolute Powerforce - Card Rulings (Version 1.0)

Codarus: If you control "A Legendary Ocean" and "Forgotten Temple of the Deep" you only need to send 1 of them to the Graveyard to activate its effect.

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OCG Rulings

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The effect of "Forgotten Temple of the Deep" which removes from play a monster from your side of the field can also be activated during the opponent's turn.: Trap Card > Forgotten Temple of the Deep: Can you activate the effect of "Forgotten Temple of the Deep" which removes from play during the opponent's turn? This is a Spell Speed 2 effect which starts a Chain Link.

The effect of "Forgotten Temple of the Deep" which removes from play a monster from your side of the field targets one Level 4 or lower Fish-, Sea Serpent-, or Aqua-Type monster that is face-up on your side of the field.

The effect of "Forgotten Temple of the Deep" which Special Summons the removed from play monster is an effect which activates during the End Phase. It is not resolved as part of the effect which removes from play the monster.: Does the effect of "Forgotten Temple of the Deep" which Special Summons start a Chain Link?

The effect of "Forgotten Temple of the Deep" which Special Summons the removed from play monster does not target.

If you gain control of an opponent's monster and remove it from play with the effect of "Forgotten Temple of the Deep", then during the End Phase the removed-from-play monster is Special Summoned to your side of the field by the effect of "Forgotten Temple of the Deep".: If you use "Forgotten Temple of the Deep" to remove from play a monster which is owned by your opponent, then it is Special Summoned to which side of the field?

If "Forgotten Temple of the Deep" is negated by "Royal Decree" or "Trap Stun", then its effect to treat it as "Umi" will be negated, so that the name of "Forgotten Temple of the Deep" will not be treated as "Umi".: If "Forgotten Temple of the Deep" is negated, then is its card name treated as "Umi"?

Mentions in Other Rulings

You can also send to the Graveyard "A Legendary Ocean" or a ":Forgotten Temple of the Deep" which has its effect active as a cost to activate the effect of "Codarus".: Effect Monster > Codarus

If you control multiple cards like "A Legendary Ocean" and "Forgotten Temple of the Deep" that are all treated as "Umi", then you can activate the effect of "Codarus" or "Levia-Dragon - Daedalus" or "Ocean Dragon Lord - Neo-Daedalus" by only sending one of those cards to the Graveyard; you do not send all of them.: Must you send both "A Legendary Ocean" and "Forgotten Temple of the Deep" to the Graveyard to activate the effect of "Codarus"?