Water Xyz Strategy (Sharks)

This Deck blinds first. Just spam Xyz monsters onto the field.

This deck heavily relies on its normal summon. If you don't have an extender after your normal summon is Ash Blossomed or negated somehow, your turn is basically over unless you have an extender in your and even with that, your turn won't be as great as it would've been. Your starters include Beautunaful Princess, Buzzsaw Shark, Lantern Shark, and Tin Goldfish. Beautunaful gets you to Buzzsaw or Lantern Shark from deck. Lantern Shark and Buzzsaw Shark get you to rank 3's, 4's, and 5's. Tin Goldfish isn't the best starter, but it does do the job well especially if you have the right extenders.

Your extenders include Beautunaful Princess (off of One for One), Left-Hand/Right-Hand Shark, White Stingray, and Xyz Remora. Tuna summons Buzzsaw or Lantern Shark from deck (the one whose effect you haven't used yet). Left and Right Hand are like midgame extenders; you really don't want to open with them. White Stingray is a very nice extender and recycler. Xyz Remora is best used to remove the materials from an Xyz monster and since you do, you special summon the 2 materials from grave an now you have 1 more xyz monster. The Xyz monster with no material can be used for Full Armored Crystalzero Lancer if it was a rank 5.

Lifeless Leaffish is just a fish target for your special summons. It can send your Left-Hand Shark from deck to grave to have an extender if you also control Right-Hand Shark. It can also recycle 3 fishes for you to draw 1 card.

Foolish Burial Goods send Xyz Revive Splash or Fury of Kairyu-Shin. Revive Slash banishes from grave to rank up a water xyz monster you control. Kairyu-Shin protects against board wipes. One for One is for Beautunaful Princess. RUM is for Number C101: Silent Honor DARK or Number c103: Ragnafinity. TTT since Called By is Limited (this deck rather play Called By but its more of a brick at this point). White Mirror for an extender and searcher. Whitefish Salvage recycles fish and floats into a fish when destroyed. TT since we are playing Kairyu-Shin. 

Extra Deck: Abyss Dweller is of course great for its effect and it is water support. Bahamut Shark summons Toadally Awesome (which is at 2 now). D/D/D Wave High King Caesar is a non opt Solemn Warning that you can rank up into with Xyz Revive Splash. Number 101: Silent Honor ARK since it is for RUM and it's removal. Number 103: Ragnazero since it's a RUM target and more removal. Number 37: Hope Woven Dragon Spider Shark since it floats into a monster (also Manga ZEXAL is waaaay better than the anime). Number C101: Silent Honor DARK and Number C101: Ragnafinity for your RUM targets. 2 Toads for Bahamut Shark. 2 Valiant Shark Lancers as Dridents and a RUM stacker. Also Mistarboy since water deck.

Side Deck has the staple himself, Nibiru, along with your third copy of Fury of Kairyu-Shin and Xyz Revive Splash. Lightning Storm for going second removal. Your second and third TT for Kairyu-Shin. 2 White Howling for spell decks. Finally, 3 Infinite Impermanence as disruption.