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The greatest problem I face as an article writer is finding something to write about. Inspiration is fickle, as motivation can also be. This is made especially difficult by the pandemic choking off my easiest content source: actual Modern tournaments. Without much happening in greater Modern to discuss and limited source material, I find myself struggling at times. Thus, I sometimes must resort to stirring up arguments to find content. If you're ever bored to tears, try kicking over a hornet's nest; you're guaranteed to not be bored anymore.
I know a lot of players, many of whom are reading this now. And some among them can be mined for content with a simple trollish jab. At the end of last week's article, I made a fairly trolly statement of support for bringing back Splinter Twin just to break its stalwarts' hearts. Cue the hornets: I was met with an angry DM complaining about how unfair it is that there are plenty of two-card combos in Modern these days, yet Twin is unavailable. I asked, why not just play one of those? The answer: "They all suck!"
So today we'll look at some of those combos, particularly the one closest to Twin, and examine why they're just not on the UR behemoth's level.
The Reincarnations...
When Twin was banned it threw Modern for a loop. Since then, there have been many attempts to claim Twin's throne. None have succeeded, primarily because Modern isn't constant year-to-year anymore. Decks can no longer simply sit atop the metagame for years, and this is probably a good thing. Decks have to evolve more often now, and each Modern season has been wildly different from the preceding one. I'd argue that Modern is in far better shape as a dynamic format than it was when Twin was always the deck to beat.
And it isn't like Modern is short on combo decks. They're mostly fringe these days, but Storm, Ad Nauseam, and Toolbox combo decks are all viable. However, I know full well that what the Twin stalwarts are looking for are two-card A+B combos. Look at any Toolbox deck, particularly pre-Lurrus of the Dream-Den, and you'll see plenty such combos, from Heliod, Sun-Crowned and Walking Ballista to Spike Feeder and Archangel of Thune to Devoted Druid combo. However, these decks are primarily combo decks, and don't scratch the itch for Twin players looking for an incidental "I Win" combo.
However, those exist too. The most recent addition is Conspicuous Snoop and Boggart Harbinger, which I've already covered.
However, well before that, the first attempt to replace Twin was just to replace Twin with Kiki-Jiki, Mirror Breaker. I remember a number of Twin players at the time desperately holding onto their decks by replacing the banned Twin with Kiki. And it kinda works. Then there's Copycat. Following its emergency banning in Standard, players have tried to make Saheeli Rai and Felidar Guardian a thing in Modern. Which also sort of works.
...Are Flawed
The problem is, as my associate so boldly declared, these decks aren't very good in Modern. I realize that I just linked to fairly lengthy results pages, but the vast majority of said results are MTGO League results, and anything can 5-0 a League. Even Mono-Green Stompy. The real measure of strength is paper success, and that has been very limited. Yes, Snoop doesn't count; it can't have paper results because paper's shut down. Snoop is seeing lots of play online, and even having success. That said, it is also the new kid on the block, and 
seeing lots of play on the basis of being new and exciting rather than necessarily good. Time will tell if Snoop was just a flavor of the month or the real deal.
As for the other decks, the best example is Copycat. Subject of only the second emergency ban in Magic's history, it has had no measurable impact on Modern. If this be an heir to the mighty Twin, a pale and callow shadow it be at best. And even if that weren't the case, it's not actually a Twin deck. Twin was an interactive deck that played a hybrid control-tempo game and then incidentally won via combo. As they said of Trix, the best control decks have to be combos. There's no room for real win conditions. Copycat and Snoop Goblins are creature decks first and foremost. They have little, if any, interaction. Their success isn't worthy of Twin's name and they don't even act like the legend. Thus, Twin doesn't have a direct lineage in Modern anymore.
One Exception
Or so it appeared. Until players remembered that there is a monster in another format. A monster that closely resembles Twin's combo and gameplan. The monster from Pioneer named Dimir Inverter. I will argue that Dimir Inverter is the closest deck Modern has to Twin, even if the combos work differently. Consider this fairly standard Twin list from its heyday:
UR Twin, Gabriel Fehr (GP Puerto Alegre)
Ah, memories. Now consider Inverter. Incidentally, when I was looking through the available decklists, I discovered that Modern Inverter is a fairly new creation. And it's only in the past month that they've taken a leaf from the Pioneer version. Before June, all the decks seem to have been trying to be pure combo decks with Angel's Grace and Spoils of the Vault. After the switch, there are far more results, and they're clustered together, indicating that embracing Inverter's innate Twinness was a strong call.
Dimir Inverter, wefald (MTGO League 5-0, 7/14)
A True Inheritor...
Ignoring the superficial differences in color and combo, the gameplan is the same for both decks. Both Twin and Inverter are interaction-heavy control-combo hybrids playing a tempo game. Twin's is entirely reactive, focusing on counterspells, while Inverter has proactive discard, but their purpose is the same: break up the opponent's gameplan until the combo is assembled. These are primarily interactive decks; they just win via combos, rather than finisher-type creatures like Baneslayer Angel.
Secondly, both decks can treat the combo as incidental. Twin's greatest defense has always been that the combo was an afterthought. The primary route to victory was attrition, tempo, and Bolt-Snap-Bolt. Sideboard games were about being a true control deck, as they often sided out most of the Twins. Inverter plays a similar game, controlling the game and then landing the Inverter of Truth to win the game. Inverter is actually a decent threat on its own, and many games never involve winning via Thassa's Oracle. I actually know of attempts to use Inverter as intended: filling the graveyard with only useful spells, playing Inverter, and winning with a small, but stacked, library.
This is in stark contrast to Copycat decks, which are piles of value creatures, cantrips, and planeswalkers more reminiscent of Ephemerate decks than Twin. Or consider Snoop Goblins, which is just a Goblin deck with the combo added. There are plenty of two card combo decks in Modern, but only one of which share's Twin's genetics. Thus, if you really want to play Twin again, why not pick up Inverter?
...In Another Format
Probably because Inverter is not replicating Twin's success in Modern. Granted, it is fairly new and is picking up more results, but most of those are League 5-0s. Compare Inverter to an established combo like Storm over the same timeframe: far more results, far more impressive tournaments. For some reason, this style of deck just isn't working in Modern. Perhaps the playerbase just isn't there, or maybe it actually isn't good enough.
This is especially strange given that Inverter is king in Pioneer. To the point that it's the default Best Deck. And those actually invested in the format hate it. And is probably the main factor driving players away from Pioneer. I actually started thinking about Modern Inverter with the expectation that Modern would see an influx of players following an Inverter ban last week. Obviously that hasn't happened, but even if it had, the evidence seems to indicate that nothing would have changed regarding Inverter's viability.
Where's the Problem?
While I think the decks are viable and reasonable in Modern, the evidence does back up that "They all suck!" assessment from earlier, at least in comparison to what Twin used to be. The most common explanation I hear is that Modern has moved on. The other answers and threats are so much better now than in Twin's heyday that its style of Magic is simply outclassed. Fatal Push, Assassin's Trophy, and Uro, Titan of Nature's Wrath didn't exist back then. This line of thought seems to conveniently ignore that Teferi, Time Raveler and Veil of Summer also didn't exist in 2015.
In Comparison
However, the fact that the answers are better doesn't explain Inverter's lack of success. The counters and discard aren't much better now than in 2015, and those are the only relevant answers to Inverter combo. The combo is creature-based, sure, but happens due to ETB triggers. Removal doesn't matter, and can't break up the combo. Once Inverter empties the library (often helped by 
Relic of Progenitus), the only thing that matters is resolving Oracle. If that happens, Inverter wins, end of story. It's a far more robust combo than Twin in that sense.
Which adds to the mystery of Inverter's poor Modern performance compared to Pioneer. Yes, there are better answers in Modern, but the answers relevant to Inverter aren't that much better. It's not about removal; it's about preventing the pieces from resolving. There are better counterspells in Modern, but they're played in smaller numbers than in Pioneer. Thoughseizesees extensive Pioneer play as a four-of, and it doesn't in Modern. Inquisition isn't Pioneer legal but Thought Erasure is and sees lots of play. Both formats have the same threat powercreep. It may be true that Modern is more powerful, but it isn't relevantly more powerful to keep out Twin's successor.
The Key
I think the problem is format speed. Pioneer is not a very fast format. Mono-Red is a good deck there, but it's got nothing on Modern Burn or Prowess. Humans regularly kills on turn four, and every combo deck is at least that fast. Inverter can hit on turn three with Eldrazi Temple, setting up a turn four Oracle, but that requires a lot to go right. It's more common to go for the combo on turn five or later in Modern. In Pioneer, there's far more time to get set up, and so this more ponderous combo is more threatening.
Moreover, players can see Inverter coming. This is also true of the other A+B non-Company combos in Modern. To go off requires playing one creature/planeswalker one turn, then the other piece the following turn. That's a clear signal that you're in danger. That was never the case with Twin. Exarch and Pestermite got flashed in on end-step for a surprise win. I've been over this before, but the power of Twin was never in the combo. Twin's advantage was being a tempo thief and keeping opponent's off their gameplan via fear. That is missing from every other deck, and that's the real reason they haven't found success.
A Lesson
There are a lot of very powerful and successful decks in Modern. There are some that ape arguably the most successful deck ever. None can match its success because they cannot take advantage of the opponent in the same way. To be successful, they're going to have to find a way on their own merits.
announcement 
being highly successful. That said, it's extremely rare for a card to be pre-emptively banned. The initial list doesn't count. Mycosynth Lattice leaps to mind as the only other example. It was very un-fun, but wasn't really having an impact when it got axed. Once Upon a Time had 
Losing Astrolabe will not significantly impact Snow's matchup against Ponza. 
Along with that retooling, Ice-Fang's stock will change. As noted, there's no way to cheat on Coatl's deathtouch anymore with Astrolabe. That will have to be earned the hard way with Snow basics, and that is a risk. Fetching three basics over shocklands was always the right call. Now, there's a risk of fetching into mana problems. A deck with Bant's intense color requirements will struggle to both cast its spells and turn on Coatl more often, meaning it can't lean as heavily on it as removal. Thus, the spell suite must be retooled as well.
I put aggro decks as the biggest winners of the banning. Coatl getting nerfed really is a huge deal. This is particularly true for Spirits, which should have a great matchup against Snow, or any durdly deck full of expensive cards which care about card advantage. Coatl props up UGx, and Spirits doesn't have good answers. It's particularly bad when critical Spirits with hexproof get sniped. Humans will also appreciate having Mantis Rider picked off at advantage less often.
three players utterly enamored of their 4-Color Snow goodstuff decks and their whining about Astrolabe and Modern doomsaying is already melting my DM inbox. I can't imagine the anguished lamentations if their other baby, Sanctuary, got hit too.
When I introduced GRx Moon to Modern Nexus, the deck didn’t have a proper analog in Modern. I’d adapted the deck from Skred Red after having adding green to that deck for 
Elephant in the room: Goyf! But why would this deck want Goyf? Not only is the creature 
Another major boon to the deck is Pillage. 
Gone are the five-drops of Ponza, in part because I'm allergic to high land counts. We've still got mana sinks mostly, the back-ends on Pyromancer and Bonecrusher. But it's more of a backup than an inevitability. That's because GRx Moon wants to keep the hits coming, whether it's turn two Moon or some speedy attackers, and end the game a little earlier.
The aggressive bump gained from deploying Goyf early pairs nicely with Bloodbraid and Klothys, which sneak in plenty of extra damage. Backup plans for disruption are extremely reliable in this deck because Goyf is joined by Wrenn and Six. The planeswalker 
Goyf's Return... NOT!
And then there's Ponza. There's 
I've been on the receiving end of this change more than I care to admit. Humans is extremely weak to Blood Moon thanks to its five-color manabase. Aether Vial is only helpful when given time, and Noble Hierarch gets Bolted a lot. Previously, this wasn't much of a problem because Moon was unlikely to hit early enough to prevent Humans from getting a board started with its nonbasic lands. Now I'm finding myself actually getting locked out more and a matchup that is, on paper, favorable is in practice very hard. Humans is generally too fast for low-removal decks to stop and has Reflector Mage and Mantis Rider, letting it zoom past land disruption. Now, it's locking in too fast.
No longer. Klothys into Glorybringer is a phenomenal curve and clock in this matchup. Seasoned Pyromancer goes wide and finds more beef. Bloodbraid Elf can swing games from nowhere. This was all possible before, but 
This is where Ponza shines. That fast Moon will shut off the fetchlands before Bant can find the basics or Astrolabe. This isn't fatal, as Bant will likely draw basics, but not necessarily the right ones. And Ponza can exacerbate that with Pillage. All while having a lot of mana to advance its clock. And what a clock! As mentioned, Klothys is a house, and as long as devotion stays low the only way Bant can avoid being drained out is to bounce, then counter, the God. However, the other creatures net value too, which lets Ponza keep up with Bant's 2-for-1's, particularly Ice-Fang Coatl.
Magus can also be tutored by Eldritch Evolution, a card that likewise grabs Winota straight from the deck. If it’s tributing Strangelroot Geist, the undying Spirit gets to swing right away with haste and trigger Winota on the same turn! And Birds both ramps into Eldritch/Winota and attacks to trigger it.
The enchantment skirts creature removal, but relies on the graveyard, while the creature bites the dust to Fatal Push but ignores Rest in Peace. As such, these two threats reward pilots for chaining together draw and burn in ways that compliment each other 
I know you remember this one! 
Among the included packages are:
There was a time when building an entire Modern deck around Notion Thief was nuts. But Narset, Parter of Veils gave the card some redundancy, and combined with the 
Here, 
