I made a Kaiju deck a while back similar to this, but i'm fairly unhappy with this, so I decided to remake it. Fun fact: Kaijus are one of my favorite archetypes. I adore the entire Kaiju genre so, the archetype itself is something I love. Deck guide? Deck guide.
3x Bigfoot- 3k beater if you get it out, easy card removal if it's discarded. Underappreciated Danger! imo
3x Chupacabra- draw/tribute fodder, and can special summon a discarded Danger! if itself is discarded.
1x Nessie- Would run at more if I could, but it's limited. 28k wall if you get out that's also just draw/tribute fodder, but if discarded, it gives you another Danger! to replace the lost Nessie, which is amazing.
2x Thunderbird- 28k beater if it special summons itself, can remove possible problem cards like Imperm and Fog Blade that your opponent has set otherwise.
1x Jackalope- Yet again, draw/tribute fodder. But if discarded, gives you another Danger! to act as tribute fodder. Fantastic Danger!, it's limited for a reason.
1x Snek Boy- can't spell his name and i'm not gonna try. Adorable card, and it gives you tribute/draw fodder and it's always tribute fodder no matter what, as it special summons itself when discarded. I'm tempted to get one just to frame it because I love this card
1x Pankratops- Easy special summon and monster removal, but can also serve as tribute fodder.
2x Dogoran- tribute monster, 3k beater
3k Gamaciel- Easy monster removal
2x Jizikuru- Fantastic 33k beater with a built in negate
2x Majesty's Fiend- stop playing lol
1x Radian- literally just tribute a monster, either an opponent's or your's, OTK lol
1x Jupiter- Requires two tributes but that's not very hard for this deck, discards two cards which can be Dangers! for their effects, and steals an opponent's monster to become a big beater
1x Pluto- Also two tributes but, hand info and if you somehow guess write ya get a free monster
3x Thunder King- The boss monster. 33k beater, attacks three times on occasion, can OTK with ease
2x Vanity's Fiend- stop playing the game lol
3x Interrupted Kaiju Slumber- Dark Hole combined with a free monster, just give your opponent a Gamaciel and it's free damage and you can go in for an OTK with ease
3x Kyouto Waterfront- Great field spell, racks up counters fast as fuck as you tear through the opponent and get rid of your own cards, can search a Kaiju when neccesary or provide counters for the Kaiju's own effects
3x Pot of Extravagance- fantastic draw power, what else do u want me to say
2x World Legacy Monstrosity- Leads into the occasional Eternity, and thins out your deck.
3x There Can Only Be One- Locks down nearly any deck and stops them from playinh, making them an easy target to OTK
The extra deck is just banish fodder, you might wanna link into Linkuribo then Gardna on occasion though, or maybe make an Eternity, but banish the rest
Playing guide
Deck is a pretty simple OTK based going second deck. You spam out Dangers! and draw if you didn't open with an Interrupted; if you did open an Interrupted, play it and destroy the board, then special summon your Thunder King and a Gamaciel for the opponent. Afterwards, spam Dangers! for tribute fodder, and tribute into either a Kaiju if you didn't use the Interrupted method, or go into a Fiend or beater with tributes. Rack up counters for Thunder King. Afterwards, set There Can Only Be if you opened with it. Attack the opponent, although you probably won't kill them in the first turn. Use the effects of the Fiends and such to make sure they just can't play, then OTK them entirely. Note: Yes, you'll want to go second. If going first, just set up your floodgates and hope. Maybe make an Eternity as well, or a Pluto for hand info before they even start their plays.
Fun fact: I'm mostly blind