We'll build this deck around the usage Twin Headed-Thunder Dragon for rank 7 fodder or a Forbidden Memories-esque beatdown. Our main combo will require Polymerization, an OG Thunder Dragon or a Thunder Dragon Fusion, or ways to acquire them (we have plenty).
Having Polymerization allows us to churn out three Twin-Headed Thunder Dragons in a single turn thanks to the recycling of Thunder Dragon Fusion and Verte Anaconda.
You'd play this for the most part like a traditional TD deck. Aloof is an excellent card in this deck for getting TD pieces and setting up the Verte Anaconda we want on the field. Once we get a poly, TD and a TDF in our hand, we go the following:
1- Ditch a TD, add 1 and ditch it again so we have 2 in GY and 1 in our hand.
2- Activate TDF, get 1 Twin-Headed and put your TD that you discarded back into your deck.
3- Since there is still a TD in your hand, use its effect to discard itself and add 2 to hand.
4- Activate your poly, get another a Twin-Headed.
5- Now that you have your grave set up, now is the time for any extra deck set up or any additional special summons that you want.
6- Activate your Verte Anaconda get your third and final Twin-Headed Thunder Dragon.
7- Beat down your opponent with unrelenting nostalgia
This deck probably won't win you a regional but it should good for a laugh when you tell your friends you're playing Thunder Dragons in 2021.