Look , WATT isnt the most powerful deck.
Arguably not the most fun either (Although its pretty fun)
But it sure is a deck that will have your oponent to say WATT !?
I got inspired by this video :
https://www.youtube.com/watch?v=NT3porFZ5W8&t=224s
And did my own 2 min twist on it.
( Have build the deck but not checking the decklist right now)
Basic combo is : Get Wattcobra on field (Can be searched from Train if you have a kaiju on your field or have Photon Sanctuary. Or you can bring it out of the deck if you have Wattkingdom)
Attack directly with cobra. -> Search Tuna -> Tuna sees direct attack and gets summoned -> Direct attack with Tuna and use it and a lv4 to go into Kyuiki -> Attack with Kyuiki and tag out to any other synchro.
Photon spark is for making Hip Hoshiningen , but can also be used to make Wattrain live and to make Colosus after using Tuna
Lumunus spark and Hip Hoshiningen both raise attack of light monsters by 500 , thats +2k for each copy you have while doing the cobra attacking.
Leeching the light gives a huge attack bost if your oponent plays lights or you have kaiju them.
Feel free to take out the watthoppers , or add the dragonflies to make them more usable .
If you manage to get two on board it ( Be it from kingdom or floating from dragonflies) you can make a lock thats hard to break for decks that dont have non-targeting removal or kaiju's
Last tip : Kingdom locks you into thunders , so it stops Sanctuary to Hip Hoshiningen and one of the kaijus (So no slumber either) but the rest all work.
If it has peeked your intrest , go have fun.