Introduction: Just Get to the Point!

Before you scoff at the post by the title and length and write off into the comments on how ridiculous of a claim this all is, I want you to come back after watching this replay using nothing but a fairly sub-optimal test hand first:
https://www.duelingbook.com/replay?id=7005-24986499
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What you just witnessed was a 60-card deck, with a sub-optimal looking hand, churn out a True King of all Calamities (VFD), Herald of the Arc Light, live 3-material Apollousa protecting from hand traps including Nibiru, and draw 2-3 cards, with more resources to spare. All with alternative plays to go around interrupts and the flexibility to potentially extend into other cards if needed.
Yeah, Igknights can do this, and they always could have done this. It's easier than it looks, more likely to happen than you think, and it's as potentially dangerous as it seems.
We need to talk about this.
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Part I: The Deck in Question

So, let's get right into it. Here's a current deck + Duelingbook download of the specific deck you just saw:
A draft of the 60-card monstrosity that is Igknights
(Duelingbook download: https://www.duelingbook.com/deck?id=7239524)
We can go over the deckbuilding decisions, card choices and the two OCG cards later, because this is not the point. I'll keep it brief: Most of the cards are non-negotiable combo pieces and/or extenders. I'll explain the Igknights in a moment. The currently-OCG Rose Dragon package is replaceable by Deskbot 001 and either Coltwing or Aerosguin for VFD setups. The only cards I'd consider cutting are Astolfo, Genba, the 2nd Olivier, or Red Layer. Neo Space Connector package is mandatory because the hand knowledge is too valuable. Arfeudutyr is because we're in a partial-Control format where popping backrow is a useful tool to have and I needed another Equip Spell name. You only need the one Gearfried and Sublimation Knight as you'll soon find out. And the Side Deck and Extra Deck can be changed to whatever your goal or preference is depending on what you're running or planning. Like I said, none of that is the point.
The point is, despite looking like a 60-card mess, this deck, and the combos it reaps, are unfathomably consistent to the point where it may just overshadow Dark Warrior Turbo as the go-to best turbo engine in the game.
But, don't go off calling blasphemy over the claim that a 60-card deck could ever be touted as consistent just yet, because there's actual math and science backing this claim.
Strap in boys, you're gonna be learning today!
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Part II: What's an Igknight?

You might have noticed the staggering amount of Igknights in the main deck. While a normal person would advise to cut down on the cards that seem like they would take up unnecessary space, the truth of the matter is: You want to run as many Igknights in the deck as possible, for the exact reason that it takes up space.
Let's start with the Igknights. They're all Normal FIRE Warrior Pendulum monster pairs ranging from Levels 3 through 6, each with Pendulum Scales 2 through 7. While they do nothing as monsters on the field, in the Pendulum Zone, they all share the same following effect:
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If you have an "Igknight" card in your other Pendulum Zone: You can destroy both cards in your Pendulum Zones, and if you do, add 1 FIRE Warrior-Type monster from your Deck or Graveyard to your hand.

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Yep. Any FIRE Warrior monster, from either your Deck or GY. Any. It can be another Igknight or a Battlin' Boxer all I care. No once per turn restriction or any noticeable restriction besides needing any other Igknight in the other zone for that matter on them either. This was made almost six years ago.
So, what does all of this mean? Well, unlike when they were first released and had almost no valuable cards to retrieve through their effects, it means Igknights act as the door to almost anything and everything imaginable when built around due to the cards they can now search and offer newfound synergy, and with great synergy to boot. That's right: Igknights, despite flopping upon their initial release, turned out to be way ahead of their time.
And MY GOD, that consistency!
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Part III: Explaining the Expectation-Shattering Consistency

As you saw from the replay, opening any 2 Igknights is equivalent to an instant Isolde by adding Sublimation Knight, a FIRE Warrior, from deck to hand and using it to spit out Squeaknight. As everyone probably knows, getting Isolde out likely leads into nasty combos and plusing that could spell doom once it hits the field. One lesser known fact about Isolde is that while you cannot summon or activate the effects of the Warrior it searches, you can still set it in Pendulum Scale. By doing this, you can complete the Pendulum Scales and retrieve the Igknights you initially popped as more fodder for your plays, and then pop the scales you currently have to search again. From there, your imagination is the limit as you have the ready materials to make almost anything.
And it doesn't stop there. You also have access to additional extenders or starters either on your person or at the beckoned call of the Igknights. What's more, you don't necessarily need the Igknights to enable Isolde, as the numerous extenders you have also provides material for an Isolde summon. If anything, the flood of Igknights makes the aspect of summoning Isolde even more consistent than any 40-card deck could do, because the Igknights all double as starters, extenders, recovery, and even combo pieces for your other extenders. Furthermore, the high number of Igknights smother the required combo pieces for the deck's success which you would rather not open and jam your opening plays, meaning they in turn provide additional consistency thanks to being redundant in all doing the same thing no matter which other Igknight is in scale with it. You also don't need to stuff the deck with too many copies of staple extenders like Olivier or Gearfried, because they are all easily-accessible and even recyclable from the GY.
All of this means that, out of the 60 cards in the deck you saw, in order to achieve anything close to the combo that went down, all you need is to open almost any combination of 3 out of the first 48 cards you see in this deck list, all thanks to the huge amount of Igknights dropped in and the utility they provide. Opening like this not only prompts the green light for the full combo, but it also at the bare minimum secures an extension if the opponent ever decides to interrupt the early parts of the combo.
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To contextualize how insanely consistent this feat actually is, let's go to a hypergeometric calculator and prove this.
Now, I use https://stattrek.com/online-calculatohypergeometric.aspx for my calculations, and it gives a detailed explanation on what the function is and how the calculator and equation works because I really do not want to waste more time on it than I have to. But here is a quick summary of the online calculator:
Boring explanation of Hypergeometric variables

• (D) = Total number of cards in deck
• (k) = Total number of desired cards you want to see in opening hand in deck
• (H) = Number of cards drawn for your opening hand
• (x) = Minimum amount of desired cards you want to see in your opening hand

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So for this example, the number of cards in the deck (D) = 60, the number of cards drawn for opening hand (H) = 5, and we need to open at least (x) = 3 out of the (k) = 48 desired cards in deck.
Now, we have our variables, so we plug them into the calculator, hit Calculate, and look for P(X ≥ x), or in this case P(X ≥ 3) because the opening hand needs at least 3 or more of the desired cards in deck. Doing so, we find that the odds of opening this combination and thus access to the full combo is...
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The results are... wait, what?
...95%.
95%!?!?
That is an ABSURD value for consistency, especially given the requirements asked for it! To give context, a full Prank-Kids deck maxing out on each individual Prank-Kid and their Field Spell plus the 1 Terraforming has 16 1-card combo starters for their full combo (assuming no interruptions), and when put into the same calculator under a 40 card deck, opens that full combo 93.5% of the time. This means that the act of opening 3 cards in a 60 card deck is around as if not more consistent than one of the most consistent 1-card combos in the game, and arguably provides a better end result.
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Now, it could be argued that there are some smaller combinations that you could open under these conditions and still not have any opening play, such as opening once-per-turn duplicates or more specific extenders like Gearfried with no way to summon it. There is also the argument that the last 12 cards are garnets that you never want to open and opening any of them would spell doom for your plan.
But, in the grand scheme of things, none of this really changes anything. Even if we try to low-ball the probability we found by factoring in said idiosyncrasies, it still wouldn't account for some of the 2-card and even 1-card plays that the deck can muster, which would by in large nearly cancel the shrunken probability.
Furthermore, none of the remaining 12 cards in the deck are "hard garnets", which means even if you had some of them in your hand, it would not mean that any part of your combo is impossible because none of them have to be in deck in order to search out or complete the combo. The calculation given factors the worst case scenario where 2 of your opening cards could very well be those last cards, but you can make a combo using them anyway. Hell, it's sometimes possible to perform a full combo even if you opened 3 of the 12 cards, but I chose to not include that possibility as to not over-complicate things and to further low-ball the overall odds.
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So to summarize, this 60-card deck asking for a 3-card combo turns out to somehow be just as if not more consistent than arguably the most consistent 1-card combo in the current game, and ends on a better board too.
Oh, and that essentially means we might have a deck that vomits out VFD more consistently and reliably than Virtual Worlds can.
Convinced yet?
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Part IV: Counterplay... if you can call it that...?

Okay, so we all see that it's pretty much guaranteed to open this monstrosity of a combo, but how easy is it to interrupt them when they go first?
Well, here's the thing: It's surprisingly difficult. Let's start with the big elephant in the room: Unless it's Ghost Ogre or they're under Droll beforehand, you cannot hand trap the Igknight effects. The Igknights are worded in a way where they pop themselves in scale as part of their effects and are not once per turn, which means even if you negated the effect with Ash Blossom or Ghost Belle, they could just do it again and you wasted your hand trap.
As for the entire combo line, because of the quick access to either Gearfried or Apollousa and the abundance of readily-available extenders either in hand or at beckoned call by the Igknights, it's frankly crazy hard to find a single choke point down the combo line before it's too late. Simple negates or interrupts like Ash, Veiler, D.D. Crow, or Belle most often than not act either as annoyances or sometimes non-factors if the correct extender happens to be on standby, or pointless by the time Gearfried or Apollousa comes out. Not even the blowout hand traps are easy roadblocks for the deck. Nibiru is easily preventable and very easy to extend past otherwise (search Olivier, summon it with its effect and use it and the token for Halq anyway), Droll isn't a guaranteed blowout because Ogier can provide a hilarious workaround to the block (remember that Igknights also add back from GY), Lancea only prevents certain avenues that can easy be replaced with other improvised plays (oh no, you can't banish for Divine Sword, it's not like you could do anything else or something), and while Gnomaterial is annoying, it's not necessarily a turn-ender on its own (you should have the extenders to make plays around it or even pop it yourself at times, you're fine). Imperming the Halq won't end the game either, because on the next turn they can tag Halq out for Roland to net a follow-up play for their next turn, while they still have a live Apollousa, typically more, at bare minimum.
The only hand traps with a radically high chance of preventing the play are Dimensional Shifter, which will completely prevent the play but is forcibly uncommon given how few decks can actually use it, Psy-Frame Gamma or Herald of Orange Light + a Fairy on the Isolde, which is difficult but still feasible for them to play around, or a very uncommon Ghost Ogre on the Igknight effect and pray that they didn't open the extender or additional Igknight. So, your best bet to prevent this deck from popping off when going first is either by opening those specific hand traps or opening at least 2, realistically more, effective hand traps against them, which given the near-guaranteed odds of them opening at least Isolde plus an extender, the odds are entirely against you.
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Part V: But can it go 2nd?

As for this deck's chances going 2nd... well as pessimistic as it sounds, who cares? With the current Tier 1 decks and unfair "you cannot play Yugioh" cards available to them, we're in a format where boardbreaking is nearly impossible thanks to VFD and (if this deck is anything to go by) hand traps either need to be perfect or extravagant in order to prevent combos from going off if they can at all. The deck here is built like an FTK turbo deck because that's what most of the format realistically is unless your deck plans to always open the perfect hand trap or blowout card at every conceivable point or set 5 backrow and hope that's enough. At that point, why bother diminishing the near-guaranteed consistency for only having a small chance for your chance to draw an interrupt to matter unless you know it will be useful after siding?
Or, you know, you could not be a nihilist and instead be a realist? Nothing is stopping you from making some room for hand traps or even board breaking tools by trading it for some of the excess consistency anyway, because that's exactly what the Side Deck is for. Besides, the Ghost Girls are all Level 3 Tuners that you can Pendulum Summon from hand off the Igknights anyway, so either way they'll be useful sometime. In theory, the deck can have about as much of a time going 2nd as pre-banlist Dragon Link did when put in that context, so take it however you like.
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Conclusion/Discussion: What the hell is this?

What we have here is, in my opinion, a custom-combo deck that is not only infuriatingly-difficult to prevent from popping off without the correct floodgate or excessive number of interrupts, but the birth of a ludicrous turbo engine with untapped potential that could very well rival Dark Warrior Turbo. It is ridiculously flexible, as it can theoretically make any strong combo board, is not restricted to specific boss monsters or combos, can waltz past most interrupts, has plenty of room for changes and additional techs given its base consistency...
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...yet, for some unexplained reason, nobody bothered to use it.
Yeah, what's strange is that none of this stuff is all that new, it's existed in the game for a long time but nobody decided to break the limits of the deck. In fact, it baffles me why nobody used this instead of the more commonplace Infernoble Knight builds that had terrible cases of opening unplayable hands. For example, by using Deskbot 001 and Mecha Phantom Beast Coltwing, it was completely possible for this Igknight build to end on 3-material Apollousa that prevented Nibiru, Borreload Savage, Herald of the Arc Light, a search off Synchro Roland in the GY, and Charles equipping and triggering a Smoke Grenade hand loop while circumventing most hand trap interactions.
All without using Linkross. While Linkross was legal!
But nobody used it.
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I don't understand the logic behind this. It couldn't have been because it was a 60-card deck because Dragon Link was pulling the same thing and proved that it could work and be consistent with 60 cards. It was entirely possible to run hand traps at the cost of some of its already-nuts consistency, so a lack of hand traps can't be the issue. It couldn't have been a meta call because Infernoble Knights were still Tier 1 at the time and during previous formats before. And it certainly couldn't be because this was a worse rendition of an already-effective deck, because this could be argued to be a better version of the deck for accomplishing the same things but with strictly better consistency and ability to play past hand traps while proving rarely any additional weaknesses.
So, what happened? Why has nobody used this in a competitive setting? Was it stubbornness? Elitism? Bandwagon mentality? A lack of innovation? If it flopped, why and how did it flop? I legitimately have no idea why or how this never took off in a competitive setting, and invite anyone to chime in on why this never left the ground the way it should have
Or, more preferably, to go out there and prove that this underappreciated deck is something to be legitimately feared by skeptics and competitors alike.