Allow me to regale you with the tale of how this deck came to be. One day, I was sitting in room, watching yu-gi-oh ZEXAL, when I though "hey, sharks deck is pretty neat. Me wanna make shark deck." So then, me made shark deck. This is that deck. It even has Silent Honor DARK.
Water xyz decks are nothing new. The main difference between this one and others like it is the inclusion of cards to go into Number C101. This is because I think the chaos sevens monsters are all pretty neat. But they do actually serve a purpose. Silent Honor DARK is annoyingly hard to get rid of while having really good removal.
Of course, thats just a supporting card. The star card of any water xyz deck, is Number 4: Stealth Kragen. It turns all monsters on the field into water types, and once per turn on a quick effect, it pops an opponents water monster. When it gets destroyed, it brings out two Stealth Kragen Spawns, and when they're destroyed, they bring back Stealth Kragen. Combining Stealth Kragen with Gozen Match will shut down any non-water decks, as it prevents them from having more than one monster on the field.
So what about going second? Does this deck get absolutley screwed going second? Not completely. If you're going second in game 2 or 3, you obviously want to side in Nibiru and Droplet. But lets say you lost the die roll, and you're going second. What do you do? You simply pray you draw Ash Blossom or Impermanence. If you do, great. You can slow your opponent down a bit.
Unless you're unlucky, this deck can usually play through one negate without too much issue. So just hope your opponents bricks or something.
In conclusion sharks are pretty scary. They go like nom nom nom and eat people.