[quote=@PKMNB0Y]
Hm... You've caught my attention... To some degree.
[/quote]

I'm gonna break this one into pieces. I don't mean any offense. It's just easier to respond in bits, so please don't take this as an attack on you or your character. Feel free to refute me if I'm wrong in any way.

[quote]Though I guess my first question (as it usually is) is what decks that don't involve some sort of degenerate loop or a lock (LOOKING AT YOU YATAGARASU) are off limits. Like, I'm going to assume things like full power PePe, Rejuv Rulers and Spellbooks with Judgement are no good, but what about...[/quote]

I actually don't have anything in mind that would be off limits. You're free to run PePe or Dragon Rulers or even Yatalock if that's your thing. We're not using a simulator. When I had the idea in mind, initially, this was because it'd be easier on people who wanted custom cards (now everybody gets three to start). I didn't think this would work at first, but after giving it some more though, I feel it takes the luck aspect out leaving everything to the skill of the duelist.  While these decks are powerful, they're not completely indestructable, and the opposing player is free to start themself off with a counter hand as they please.

[quote](LOOKING AT YOU YATAGARASU)[/quote]

Not even that good anymore, what with all the decks that play out of the grave. Necro Gardna and Electromagnetic Turtle, for example, can use their effects in the grave to keep Yata Garasu from dealing damage, so its effect can't go off. If the opponent didn't empty your hand out, you might have access to something like Effect Veiler, so its effect doesn't go off in the first place, and it can't bounce itself back, allowing you to beat over it- and Yata Garasu isn't a difficult card to beat over.

[quote]PePe, Rejuv Rulers and Spellbooks[/quote]

Pepe and Spellbooks are both easily shut down by any deck with the ability to banish. Banisher of Light and Banisher of Radiance are both easy to summon monsters. If you can get it out on the first turn, those two decks can't play. Masked HERO Dark Law can do this and also punish for adding hand advantage. Droll & Lock Bird can keep the opponent from gaining any advantage whatsoever.

[quote]Well, I would mention Nekroz, but Djinn lock is dirty business.[/quote]

I used to Djinn lock with Hungry Burger. It was fun. That said, any spot removal could easily handle it and there are plenty of cards that prevent special summoning.

tl;dr: Hand Traps.