|Territory of the Sharks|
The Level of all WATER monsters you control becomes 4 until the end of the turn. This Skill can only be used once per turn and twice per Duel. This Skill can only be used if you beign the Duel with a Deck/Extra Deck that contains no monsters other than WATER monsters.
Deep Sea Diva is a great at enabling Extra Deck plays. Special Summon Atlantean Marksman and pair with Deep Sea Diva to make a Level-5 like Crystron Ametryx. You can also Special Summon another Level-2 Sea Serpent like Atlantean Heavy Infantry to make a Rank-2 Xyz, but currently there are no Rank-2 WATER monsters.
Territory of the Sharks takes your combos with Deep Sea Diva to a different level by giving more versatility to the things you can make. Special Summon any WATER Sea Serpent from the Deck with Deep Sea Diva then make them both into Level-4 materials for a Rank-4. This will usually be Spider Shark or Abyss Dweller.
Currently, Level-6 has the best pool of WATER Synchros so a Level-4 monster like Silent Angler is a great pair to your Tuners. Special Summon Silent Angler for no cost then use it with Deep Sea Diva and Graydle Slime Jr to make Brionac and other Level-6 Synchros. Silent Angler also makes a great Xyz material. Normal Summon Silent Angler then Special Summon another copy to make Spider Shark or other Rank-4s.
Atlantean Marksman and Heavy Infantry can destroy enemy set cards and face-up cards respectively. Activate their effects by discarding them as cost for Abyss Soldier or Brionac's effect. This means you won't have to discard as much when trying to field wipe the opponent with Brionac.
|WATER Sea Serpent ★3|
ATK 1400 / DEF 0
|Gaia Genesis [SR]|
Selection Box Vol.04 [SR]
|When this card inflicts battle damage to your opponent: You can Special Summon 1 Level 4 or lower "Atlantean" Sea Serpent-Type monster from your Deck, except "Atlantean Marksman". When this card is sent to the Graveyard to activate a WATER monster's effect: Target 1 Set card your opponent controls; destroy that target.|
With effects like Brionac's mass removal and Spider Shark's mass debuff available to this Deck, it's not too unlikely for Marksman to deal damage to your opponent. In this case you can Special Summon Atlantean Attack Squad to push more damage.
Atlantean Heavy Infantry
|WATER Sea Serpent ★2|
ATK 0 / DEF 1600
|Gaia Genesis [SR]|
|During your Main Phase, you can Normal Summon 1 Level 4 or lower Sea Serpent-Type monster in addition to your Normal Summon/Set. (You can only gain this effect once per turn.) When this card is sent to the Graveyard to activate a WATER monster's effect: Target 1 face-up card your opponent controls; destroy that target.|
The extra Normal Summon by Heavy Infantry can help you combo into Level-6 Synchros. Normal Summon Heavy Infantry then Normal Summon Deep Sea Diva. Special Summon a Level-2 from the Deck then make your Level-6 Synchro. Or you could use Heavy Infantry's extra Normal Summon to swarm the field then activate Territory of the Sharks and make a Rank-4.
Graydle Slime Jr.
|WATER Aqua ★2|
ATK 0 / DEF 2000
|Judgement Force [R]|
|When this card is Normal Summoned: You can target 1 "Graydle" monster in your Graveyard; you cannot Special Summon monsters for the rest of this turn, except WATER monsters, also Special Summon that target, then you can Special Summon 1 Aqua-Type monster with the same Level from your hand. When this card is destroyed by battle and sent to the Graveyard: You can Special Summon 1 "Graydle" monster from your Deck.|
You'll pretty much need to use Graydle Slime Jr. as the Tuner when making Graydle Dragon. Making a Level-8 Synchro with Territory of the Sharks is pretty easy because you'll turn both the Tuner and non-Tuner into Level-4 monsters.
Graydle Slime Jr. also acts as the revival card for Graydle Dragon. And the its floating effect essentially means you can replace it with another copy of itself.
|Judgement Force [SR]|
|You can target 1 other "Graydle" card you control and 1 card your opponent controls; destroy them. During your End Phase: You can add 1 "Graydle" card from your Deck to your hand. You can only use 1 "Graydle Impact" effect per turn, and only once that turn.|
Graydle Impact fetches Graydle Slime Jr. For the removal effect, you can destroy a Slime Jr. you Normal Summoned to revive Graydle Dragon. Or you can destroy Graydle Dragon if you have another (properly summoned) copy of it in the graveyard.
|WATER Aqua ★8|
ATK 3000 / DEF 2000
|Judgement Force [R]|
|1 Aqua-Type Tuner + 1 or more non-Tuner monsters|
When this card is Synchro Summoned: You can target cards your opponent controls, up to the number of WATER monsters used for the Synchro Summon of this card; destroy them. If this card is destroyed by battle or card effect and sent to the Graveyard: You can target 1 other WATER monster in your Graveyard; Special Summon it, but its effects are negated. You can only use each effect of "Graydle Dragon" once per turn.
Upon Normal Summoning, Graydle Dragon will usually allow you to destroy two enemy cards, or destroy three if you summon it with Slime Jr., Silent Angler, and Heavy Infantry. This should be good enough to break the opponent's setup and put them in a bad spot. If you use three materials then Graydle Dragon can get rid of a full field of monsters.
Graydle Dragon's floating effect is also quite powerful, effectively letting you revive anything in this Deck, including Extra Deck monsters. If you have another copy of Graydle Dragon in the graveyard, you can choose that as revival target to have constant field presence.
|Valiant Souls [UR]|
|Target 1 face-up monster your opponent controls; change it to face-down Defense Position. Once per Chain, when a Trap Card is activated while this card is in your Graveyard: Special Summon this card as a Normal Monster (Aqua-Type/WATER/Level 2/ATK 1200/DEF 0). (This card is NOT treated as a Trap Card.) If Summoned this way, this card is unaffected by monster effects, also banish it when it leaves the field.|
Canadia is a good tech card for disrupting enemy combos. For example you could flip Noble Knight Medraut face-down to stop a Noble Knight player from performing their full combo. The battle position changing can also be used defensively, flipping an attacking monster face-down.
Lastly, Canadia can be summoned as a WATER monster so you can adjust its Level with your Skill then use as Xyz material. It can also be used as Synchro material with Deep Sea Diva and Atlantean Heavy Infantry.
Brionac, Dragon of the Ice Barrier
|WATER Sea Serpent ★6|
ATK 2300 / DEF 1400
|Aerial Assault [UR]|
|1 Tuner + 1+ non-Tuner monsters|
You can discard any number of cards to the GY, then target the same number of cards your opponent controls; return those cards to the hand. You can only use this effect of "Brionac, Dragon of the Ice Barrier" once per turn.
Brionac lets you get rid of multiple enemy cards by also discarding as many cards as cost. This effect can even be used to clear your opponent's entire field. You can discard Atlantean monsters as cost for Brionac's effect for extra destructive power.
White Aura Dolphin
|WATER Fish ★6|
ATK 2400 / DEF 1000
|Cybernetic Rebellion [SR]|
|1 Tuner + 1+ non-Tuner monsters|
Once per turn: You can target 1 face-up monster your opponent controls; its ATK becomes half its original ATK until the end of this turn. If this card you control is destroyed by an opponent's card (by battle or card effect) and sent to your GY: You can banish 1 other WATER monster from your GY; Special Summon this card, and if you do, it is treated as a Tuner.
White Aura Dolphin can halve an enemy monster's ATK so you can attack over it. This effect has no cost and can be activated once every turn. White Aura Dolphin also has an inherent revival effect. In a Deck full of WATER monsters such as this, you can effectively revive White Aura Dolphin as much as you want.
|WATER Machine ★5|
ATK 2500 / DEF 1500
|Cybernetic Rebellion [R]|
|1 Tuner + 1 or more non-Tuner monsters|
If this card is Synchro Summoned: You can change all face-up Special Summoned monsters your opponent controls to Defense Position. If this Synchro Summoned card is destroyed by battle or card effect: You can target 1 "Crystron" monster in your Graveyard, except a Synchro Monster; Special Summon it.
The most powerful monsters are usually Special Summoned. So upon summoning Ametryx, you'll be changing the enemy boss monster to defense position. And in most cases this will allow you to attack over their weak DEF stat.
Number 37: Hope Woven Dragon Spider Shark
|WATER Fish ★4|
ATK 2600 / DEF 2100
|Shark Fang [UR]|
|2 Level 4 WATER monsters|
When any player's monster declares an attack: You can detach 1 Xyz Material from this card; all monsters your opponent currently controls lose 1000 ATK until the end of this turn. When this card is destroyed by battle or card effect and sent to the Graveyard: You can target 1 other monster in your Graveyard; Special Summon it. You can only use each effect of "Number 37: Hope Woven Dragon Spider Shark" once per turn.
Spider Shark is a powerful boss monster in many WATER Decks, especially ones that use Territory of the Sharks. The Skill makes it very easy to get Spider Shark on the field. The first effect is enough to entirely deter the opponent from attacking while Spider Shark is on the field. It also lets you beatdown enemy monsters even though your deck generally has below average ATK without complete buffs.
The floating effect is essentially a Monster Reborn. You can even revive another copy of Spider Shark and other Extra Deck monsters.
|WATER Sea Serpent ★4|
ATK 1700 / DEF 1400
|Photons of Galaxy [UR]|
|2 Level 4 monsters|
While this card has an Xyz Material attached that was originally WATER, all WATER monsters you control gain 500 ATK. Once per turn, during either player's turn: You can detach 1 Xyz Material from this card; any card effects that activate in your opponent's Graveyard cannot be activated this turn.
Abyss Dweller is another popular Xyz monster run in Territory of the Sharks Decks. This monster is great at preventing the opponent from using resources from the graveyard such as The White Stone of Ancients and all Noble Arms. But making Spider Shark usually take priority.
Make sure to toggle your chain to "ON" instead of "AUTO" then use Abyss Dweller's effect at the start of the opponent's turn for best results.
Merrowgeist's effect can be useful to disrupt enemy decks that have a lot of graveyard recursion. But her low ATK makes it difficult for her to actually destroy monsters by battle unless Spider Shark is also on the field.
|WATER Aqua ★7|
ATK 1700 / DEF 2400
|Cybernetic Rebellion [UR]|
|You can discard 1 other WATER monster to the Graveyard; Special Summon this card from your hand. When you do: Add 1 Level 4 or lower "Mermail" monster from your Deck to your hand. You can only use this effect of "Mermail Abyssteus" once per turn.|
|WATER Aqua |
ATK 1000 / DEF 200
|Cybernetic Rebellion [N]|
Shark Fang [N]
|When this card is added from your Deck or Graveyard to your hand by a card effect: You can Special Summon this card from your hand. You must control a "Mermail" monster to activate and to resolve this effect. When this card is Special Summoned by the effect of a "Mermail" monster: You can target 1 Level 3 or lower "Mermail" monster in your Graveyard; Special Summon that target. You can only use 1 "Mermail Abyssdine" effect per turn, and only once that turn.|
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