This is a budget D/D/D list that I own in real life and use in my locals. The build itself is pretty stale and that kinda makes me sad so as always I ask for your opinions in the comments.
Since I don't plan on explaining my main deck choices I will make up by explaining my side deck choices.
Kaijus: As you can understand I side in Kaijus in case I have to second against a deck that brings out troublesome monsters that I would not like to deal with (some kind of negate - Toad for instance). Specifically, Gadarla is a pretty mainstream way to deal with Floos (although I only own 1 copy of her)
Harpie's Feather Duster / Twin Twisters: Well classic backrow removal cards since I happen to face trap based decks (Floodlich for instance) pretty often
Dark Hole: By no means I suggest using this card. The real reason I run this one in my side is 'cause (along with DRNM) it's a pretty famous meme in our local community. Still it can do it's job.
Forbidden Chalice: This is my ultra budget alternative to Infinite Impermance since I still haven't bought my playset. Although a versatile card I firmly believe that Impermance is much better in the current meta so I would prefer running it instead. Nevertheless, Forbidden Chalice provides a potential negate.
Contract with Eternal Darkness: Is there really anything to say about this card? It's effect is pretty insane and can help in a variety of matchups (although it won't help much against decks like Tears and Sprights and that's my reason for running Patent License on main instead).
Contract with the Errors: This is an immense countermeasure for trap decks and it's ofc my trump card against them
Contract with the WItch: A classic way to fight against cards like DRNM and Droplet, since it allows Siegfried to negate them by becoming the CL3 (CL1 - DRNM, CL2 - Witch, CL3 - Siegfried)
Dimensional Barrier: One of the strongest floodgates in the format nothing more to say
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