All right, gave my first go at thunder dragon danger combo. I've not looked at any list format, but faced a few and have a pretty decent idea how they work.
https://imgur.com/VszCIPO First draft of my understanding of the deck without any viewings of other decks to modify with, that way I can see what I know prior to my input.
Thunder Dragon Danger Notes
Thunder Dragon Engine
Mained
Monsters
3 Thunder Dragon: Activates in hand for colossus, adds 2 more for dangers, and fulfills lights.
3 Thunder Dragondark: Activates in hand for Collossus, adds itself, if banished, adds anyone. OPTed
1 Thunder Dragonhawk: Eh opener, but a combo piece for plays.
2 Thunder Dragonroar: In hand renewer, summons from deck if banished, OPTed
1 Thunder Dragonduo: Searchable chaos monster
Spells
1 Thunder Dragon Fusion: Searchable high level drop recycler spell.
1 Gold Sarcophagus: Triggers any Thunder Dragon
Extra
3 Thunder Dragon Colossus: Easy to summon mistake lv 8 wall.
1 Thunder Dragon Titan: Removal, also banishes from hand if need be. Light attribute.
Chaos
1 Darkest Diabolos, Lord of the Lair: OPTed level 8 from colossus tribute, eats hand.
2 Chaos Dragon Levianeer: Level 8 OPTed hand eater chaos monster with grind utility.
1 Chaos Emperor, the Dragon of Armageddon: OPTed +1 chaos monster. Potential removal.
2 Eclipse Wyvern: Light banish for chaos monsters, dragon for guardragons
3 White Dragon Wyverburster: Light summons, adds the dark version, banish set-up, dragon
2 Black Dragon Collapserpent: Dark summons, adds light version, banish set-up, dragon
Extradeck
1 Number 38: Hope Harbinger Dragon Titanic Galaxy: Spell negate rank 8
1 Number 22: Zombiestein: Giant stick that negates anything rank 8
Dangers
3 Danger!? Tsuchinoko?: Self summoning Danger
3 Danger!? Jackalope?: Any level summoning Danger
3 Danger! Nessie!: Danger Searcher
1 Danger! Chupacabra!: GY revive Danger
1 Danger! Thunderbird!: Level 8 and set popping Danger
Guardragons (Extra Deck)
1 Guardragon Elpy: Dragon fuel, summons dragon from deck
1 Guardragon Pisty: Dragon fuel, summons dragon in GY or that is banished
1 Guardragon Agarpain: Dragon Fuel, Summons Dragon From Extradeck
1 Hieratic Seal of the Heavenly Spheres: Ending Dragon of Disruption
1 Hot Red Dragon Archfiend Abyss: Agarpain Summon, negate stick
3 allure of darkness: Draw power, potential +1
1 Phantom Skyblaster: Swarmnig is fun
Extradeck Power Cards
2 Saryuja Skull Dread: CA producing Dragon of summoning power.
1 Knightmare Phoenix: Blowing up backrow is fun
1 Borrelsword Dragon: Otks are fun
Sideboard:
3 The Winged Dragon of Ra - Sphere Mode: Bye swarms, titan can pop, or I’ll just let it go
3 Artifact Lancea: Light Attribute combo hate ftw
3 Called by the Grave: Outs hand traps and disrupts some turn 1 support lately
3 Mystical Space typhoon: Outs mine, orcust field spell, backrow, floodgates etc.
3 Red Reboot: GG traps