Fish-type Synchros. Because we don't have any of those at all

[Neutrality Man]

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Ascendant of the Deep
WATER Fish-type
Level 2 | Scale 0
600 / 2500
Synchro / Tuner / Pendulum / Effect
 

P-Eff
Once per turn: return 1 WATER monster you control to the bottom of the Deck; this turn, Fish-type monsters you control cannot be destroyed by battle or by card effects.
 

M-eff
1 WATER Tuner + 1 non-Tuner monster
If this card is sent to the Extra Deck as Synchro Material for a Synchro Summon: you can place it in your Pendulum Zone. Once per turn, during either player's turn: you can reveal 1 Fish-type monster in your hand; Special Summon 1 monster from your Deck with the same Level as the revealed monster, then shuffle the revealed monster into the Deck.

 

 

Emperor of the Deep

WATER | Fish-type
Level 8 | Scale 9
2600 / 3000
Synchro / Pendulum / Effect

P-Eff
If you do not control a "Deep" Pendulum card in your other Pendulum Zone: this card's Pendulum Scale becomes 4. You can Tribute Summon Fish-type monsters for 1 less tribute.
 

M-Eff

1 Tuner Synchro Monster + 1 or more non-Tuner WATER monsters
Destroy all FIRE monsters that battle with this card without damage calculation. This card gains 400 ATK for each Fish-type monster you control. If this card is sent from the field to the Extra Deck face-up: you can target 1 card in any Pendulum Zone; destroy that target (if any). Also, after that, place this card in an open Pendulum Zone on your side of the field.