Mako Tsunami was a terrible duelist.

[SephirothKirby]

Aquatic monsters hiding under the sea? When did that become plausible?

 

Oh. Now.

 

Endless Ocean

[Field Spell]

This card's name is treated as "Umi". Aqua, Fish, and Sea Serpent monsters can be Normal Summoned in face-down Attack Position. Once per turn, you can select and activate one of the following effects.

● Rearrange the face-down monsters on your side of the field, then return them to their original positions.

● Flip one Aqua, Fish, or Sea Serpent monster into face-down Attack Position.

When this card is sent to the Graveyard, you can discard 1 WATER Monster to add 1 "Umi" from your Deck or Graveyard to your hand.

 

[●] Monsters can attack while in face-down Attack Position. If they do, they are flipped to show the attack, and then returned to face-down Attack Position after Damage Calculation. Flip Effects do not activate at this time.

[●] Monsters that are in face-down Attack Position cannot be targeted by cards like "Smashing Ground", but a battle is carried as if both monsters were in Attack. Flip Effects activate for the DEFENDING monster.

[●] You can Flip Summon face-down Attack Position monsters. In which case, they are simply switched to face-up Attack Position.

 

Devil Kraken

WATER

Level 4

Aqua / Effect

If you control a face-up "Umi" and a face-up WATER Monster other than "Fiend Kraken", you can Special Summon this card from your hand. When your opponent's monster attacks this card in face-down Attack Position, destroy the attacking monster after Damage Calculation.

ATK/ 1200 DEF/ 1400

 

Great White Terror

WATER

Level 5

Fish / Effect

If you control a face-up "Umi", you can Special Summon this card from your Graveyard by removing from play 1 WATER monster in your Graveyard. If this card declares an attack while in face-down Attack Position, during battle between this attacking card and a Defense Position monster whose DEF is lower than the ATK of this card, inflict the difference as Battle Damage to your opponent.

ATK/ 1500 DEF/ 1200

 

Great White

WATER

Level 4

Fish / Effect

While this card is face-down, it gains 500 ATK and DEF.

ATK/ 1600 DEF/ 800

 

Jellyfish

WATER

Level 4

Aqua / Effect

If this card is in face-down Attack Position, you can Flip it into face-up Defense Position to negate the effect of a Spell, Trap, or Monster Effect that targets 1 WATER Monster you control.

ATK/ 1200 DEF/ 1500

 

Leviathan

WATER

Level 5

Sea Serpent / Effect

This card can be Special Summoned by tributing 1 face-up "Umi" on the field. If this card attacks, your opponent cannot activate any Spell or Trap Cards until the end of the Damage Step. Once per turn, you can select one of your opponent's unoccupied Card Zones. As long as this card remains on the field (even if it is flipped face-down) your opponent cannot place cards in that Card Zone.

ATK/ 1800 DEF/ 1500

 

Water Omotics

WATER

Level 4

Aqua / Effect

When this card is Flip Summoned from face-down Attack Position, declare Spell or Trap, and destroy one card of the type you declared. If the selected card is Set, pick up and see the card. If it is the type you declared, it is destroyed.

ATK/ 1400 DEF/ 1200

 

God of the Abyss - Leviathan

WATER

Level 8

Sea Serpent / Effect

This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by tributing 1 "Leviathan" you control, and all Card Zones selected with "Leviathan"'s effect are still considered occupied until this card is removed from the field. If "Umi" is not active, this card is destroyed. Once per turn, you can remove from play any number of spell cards, and Special Summon a WATER monster who's level is equal to the amount of Spell Cards you removed. When this card is sent from the field to the Graveyard, destroy all cards on the field, and Special Summon 1 Aqua, Fish, or Sea Serpent monster from your Graveyard.

 

Sea Stealth Attack

[Quick-Play Spell]

Flip one face-down monster you control into face-up Attack Position. Flip Effects are not activated at this time. If the flipped monster was a WATER Monster, destroy 1 card on the field.

 

Burst Tsunami

[Quick-Play Spell]

Change 1 face-up Aqua, Fish, or Sea Serpent monster you control into face-down Attack Position. Then, you can add 1 "Burst Tsunami" to from your Deck to your Hand.

 

Full Moon

[Continuous Spell Card]

You can discard 1 card to negate the effect of a card that targets a face-up WATER monster you control and destroy that card. All WATER monsters you control gain 500 ATK and DEF. When this card is destroyed and sent to the Graveyard, destroy any Field Spells currently active.

[Valkyrie Lupia Blitzer]

Why are you retraining Water Omotics, Jellyfish, and Great WHite with the same names?

 

Speaking of Great White, doesn't it temporarily lose its ATK boost when it attacks?

[SephirothKirby]

Would anyone really complain if I retrained vanillas that aren't even good in a Normal Deck?

 

Also, I wasn't sure how to word Great White, but the face-up during Damage Calculation thing wouldn't mean it isn't face-down, it's just to show it's ATK.