With struggling battle out and at 3 its the perfect time to build a deck aimed towards going second and abuse this new trap card. I've gone through a few different possible engines and decided on mermails because their in-built destruction from the atlanteans suits going second very well and is very consistent, opening with an OTK combo in more than half of the games played if its built right. There's also moray of greed which de-bricks inevitable bad hands and helps dig for struggling battle or a needed twin twisters/raigeki/dark hole. It has access to great extra deck options too like big eye to steal the monster that survived struggling battle or dracossack if you need to make a defensive play because you opened with struggling battle and cant OTK until next turn. Moulinglacia is a great card too, pushing the huge gap in card advantage even further with its delinquent duo effect. Abyss-Scale equips make for good defensive plays too, forcing your opponent to burn a card for nothing in order to do something. I didn't go too heavy on the hand traps because I don't want to have a hand that literally only does something during my opponents turn.
The side deck is a little rushed but is made with the same idea of going second in mind. The other hand traps are a no brainer, the water kaiju deals with a lot of different decks and can be used with moray of greed if it isn't needed. Forbidden chalice serves a similar purpose: turn off or bait a monster effect that's going to get in the way of your big play. Barrier statue is a great card shutting down almost everything and if not for its tiny 1000 atk it would have no down side since this deck can do fine without its normal summon a lot of the time.
Monsters - 26
2x Atlantean Dragoons
3x Atlantean Heavy Infantry
3x Atlantean Marksman
1x Deep Sea Diva
3x Ghost Ogre & Snow Rabbit
1x Maxx "C"
3x Mermail Abyssgunde
3x Mermail Abyssmegalo
1x Mermail Abysspike
2x Mermail Abyssteus
1x Moulinglacia the Elemental Lord
3x Neptabyss, the Atlantean Prince
Spells - 11
1x Abyss-Scale of the Kraken
1x Abyss-Scale of the Mizuchi
1x Dark Hole
3x Localized Trunade
3x Moray of Greed
1x One For One
1x Raigeki
Traps - 3
3x Struggling Battle
Side Deck 15
3x Ash Blossom & Joyous Spring
3x Barrier Statue of the Torrent
3x Gameciel, the Sea Turtle Kaiju
2x Retaliating "C"
2x Forbidden Chalice
2x Twin Twisters
Extra Deck - 15
1x Armory Arm
1x Black Rose Dragon
1x Brionac, Dragon of the Ice Barrier
1x Cryston Ametrix
1x Gungnir, Dragon of the Ice Barrier
1x Hi-Speedroid Chanbara
1x Trishula, Dragon of the Ice Barrier
1x Armored Kappa
1x Mecha Phantom Beast Dracossack
1x Mermail Abyssgaios
1x Number 11: Big Eye
1x Number 28: Titanic Moth
1x Number 74: Master of Blades
1x Sylvan Princessprite
1x The Phantom Knights of Break Sword