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Humans is currently the best deck in Modern. The data is very clear about this: Humans is on top everywhere and has been for most of the year. This is causing a kind of dynamic stability to take over the format. The top decks have remained relatively the same for some time while the rest of the metagame shifts beneath them. One would think this stability is ripe for exploitation, but that isn't happening yet. I find this perplexing.
Today I will be looking at the metagame that Humans has wrought. I will examine the dynamic stability of the format and why I believe that it should have been taken advantage of already. The fact that the equilibrium has persisted will be discussed and I will explain my take as to why. I believe that Humans is driving a perception of the metagame that isn't true and this has prevented destabilization.
The Thing About Humans
I've always been surprised by Humans' success. It made sense for it to do well initially, as it 
was perfectly designed to destroy Storm back when Storm was popular. Since then I've been expecting it to drop off, but the opposite has happened. I don't know why this is happening because I know that Humans is very vulnerable to Jeskai decks. I absolutely destroyed Humans with Jeskai Tempo every time we crossed paths last year. Humans is filled with small creatures that die to Lightning Bolt at parity, and Spell Queller proved to be a house.
I'll admit that I dismissed the deck. Based on what I saw, it didn't appear that it could hang with the midrange decks of Modern. I was wrong, and Humans has become "The Deck" while control has declined. It's been a struggle to understand why, especially because the current iteration of Humans is not dramatically different from the one back in October.
Metagame Stability
Modern is dynamic and diverse, but that doesn't mean that it cannot or does not stabilize. What I mean is that often we've seen the same decks maintain their positions at the top of the metagame for months on end while there is considerable movement beneath them. This doesn't mean the format is unhealthy by any stretch, just that certain decks have proven that, given what is going on in Modern right now, they are better than other options. Decks may remain Tier 1 for a very long time without causing dynamic equilibrium *cough* Affinity *cough* because their relative position in Tier 1 changes often. As the top decks have been set for several months, I'd argue that we are in a dynamic equilibrium.
Is It Exploitable?
Equilibrium is neither inherently good nor bad. That is determined by context, specifically the fairness of the decks. Given how many fair creature decks are on top, I would argue that this current one is healthy and good. Furthermore, I believe that the stabilization of the metagame around Humans is exploitable. Last year the metagame was in dynamic equilibrium between Eldrazi Tron and Grixis Death's Shadow for most of the summer before Storm disrupted things that fall. This wasn't an easy metagame to attack because it was 
polarized between a big-mana deck and a hyper efficient disruption deck. There's a saying from Theros-era Standard that Thoughtseize is better than any answer, and it was on display last year. However, this equilibrium isn't like that one.
The current metagame sees Humans clearly at the top of the pile with Affinity, Jund, and Hollow One elbowing each other for second place. Tron and Eldrazi variants sit in third with Burn not far behind. While there has been some adjustment and movement, these decks have consistently been on top of Modern since February, and the order hasn't changed much since March. This equilibrium consists of a lot of creature decks, three of which (Humans, Affinity, Burn) are very similar creature decks—arguably four if you count RG Eldrazi separately. Against those decks, removal-heavy archetypes like Mardu Pyromancer, UWx Control, or Blue Moon should be favored. They play piles of removal for creatures and have strong disruption against the slow decks. They should be able to topple Tier 1.
The Inexplicable
Why isn't Jeskai Control more of a force? Or Pyromancer for that matter? Jeskai was a Tier 1 deck at the end of last year, and the metagame seems primed for it to thrive. Humans and Affinity are very good matchups, Jund and Eldrazi are no worse than even, and Tron is winnable with a good sideboard. The only truly terrible matchup is Bogles. However, its metagame share continues to decline while its presumptive prey continues to thrive. This doesn't make logical sense, so there must be more going on.
My Theory
I believe that the reason for Humans's continued prominence despite its vulnerabilities comes down to two factors, one intrinsic and the other extrinsic. The intrinsic reason is that Humans can power through a traditional control gameplan because it cannot really be exhausted, which fuels a perception of it being a poor matchup. The extrinsic one is the effect that Hollow One is having on players. Not the format itself per se, but the perceptions of the players. It looks like control is weak against the deck, and this belief fuels an unfounded fear of Hollow One, which keeps players away from actually playing control.
Don't get me wrong, Humans is a powerful deck. We've been over this a few times, but pairing disruption with a clock—especially a clock that doubles as disruption—is powerful. Add to that a high threat density and it appears to be very intimidating for reactive decks to answer Humans. The deck has around 18 lands, four Aether Vial, and 28 creatures. It's very unlikely that the board will ever be completely clear, which can make winning the game a dicey task for a control deck. You never know if a topdecked Thalia's Lieutenant or Mantis Rider will suddenly wreck you.
The disruption can be easily overcome through efficiency and answer diversity, but the second problem requires adjustment. Rather than take the full control route, you need to transition over to attack once the initial wave is dealt with. This is what Jeskai Tempo is good at, and why I had so much success last year. However, pure control decks struggle with this, and I think this is why they're dropping off.
As for Hollow One, I both do and don't understand the fear. Yes, giant creatures on turn three are scary and hard to beat. So is potentially getting wrecked randomly discarding critical cards to Burning Inquiry. It is possible for a great hand to become terrible when you randomly discard all your lands.
However, those are pretty low percentage outcomes. I've been across from Burning Inquiry a lot and I've been wrecked by the card as often as my opponent. Granted, my circumstances are unique because I know guys that have been trying to make Waste Not work for years now—but I find that most of the time there's no measurable change to my hand quality, and I end up improved as often as damaged. A well-built control deck should have enough redundancy that it can overcome Inquiry, but the feel-bad aspect keeps players away.
The Jund Factor
One factor that cannot be underestimated is the return of Jund. The deck virtually disappeared last year, but has reemerged since Bloodbraid Elf was unbanned. Jund was a very even matchup for control in the past, but Bloodbraid has changed things. As I've mentioned before, Bloodbraid is very good against control decks, and employs a similar general strategy. I strongly suspect a lot of missing control players are actually on Jund because the deck feels better in the current meta.
The Jace Factor
Another problem is Jace, the Mind Sculptor. Jace may not have made much of an impact on the format as a whole, but it does loom over deckbuilding decisions. When I tested Jace, I found that he excelled in fair midrange games but didn't have much impact against fast decks. In midrange or control games Jace provides an enormous selection advantage and, over time, overwhelming card advantage. By the time Jace comes down against aggro or combo, the 
game should already be won. As a result I concluded that Jace would serve as the ultimate trump card for fair decks and push decks to either adopt him or go under him. I would argue this is exactly what has actually happened in Modern this year.
Since Jace was unbanned, my experience has largely validated this conclusion. Jace dominates control mirrors but he's largely irrelevant in other matchups. Jace will dominate an empty board, but there are so many haste creatures running around that Jace is never really safe. Therefore I don't really want Jace most of the time, but I feel compelled to play him anyway. Not having him is backbreaking when your opponent does. I suspect that many players feel the same way, as Jace appears in control decks all over the place, but only in small numbers. I suspect this deckbuilding tension is a significant factor in players not playing control, despite the advantages. Whether correct or not, feeling trapped into making certain deckbuilding decisions is not fun. I personally have opted to avoid actually playing control decks for more than a month for this reason, and I wouldn't be surprised if many potential control pilots were making the same choice.
My Solution
These problems provide parameters to work with, and with some finagling there is plenty of opportunity for control decks. If I were to build a control deck for the current open meta, I would definitely go Jeskai. If I go straight UW it will be harder to shift between roles, because Jeskai's burn makes going beatdown easier. I also prefer not to compete on the same axis in control mirrors and I've seen more UW than Jeskai Control in recent months. Given that counterspells and conditional removal are only situationally good, I would preference hard removal. Considering the format's speed and the resilience of Humans, I want a faster clock. Therefore, if I were to play control, I would play this deck:
Jeskai Tempo, by David Ernenwein
Jeskai Tempo is good enough against Humans that I don't like shifting to a full-control build. Plus I can avoid worrying about Jace and just win. The changes I am making to the maindeck are targeted towards Humans and Hollow One. Counters aren't very powerful against either deck so I cut back and opted for the easier-to-cast Mana Leak over Logic Knot. This does make me weaker against big mana, but I feel that's an acceptable trade-off to have a counterspell that will always work on turn two. The prevalence of graveyard hate in the overall metagame means that Knot will often be poor anyway.
Declaration in Stone seems strange, but it is the right solution to the control problem. As previously mentioned, putting creatures into the graveyard is a liability and the power of Hollow One comes from dumping multiple Hollow Ones, Bloodghasts, and Flamewake Phoenix's into play during the first few turns. Declaration is the cheapest way available to Jeskai to deal with those threats permanently. You also don't care about giving them clues very much. Hollow One has few threats so turning creatures into clues usually just lets them draw more air. Declaration also has the benefit of cleaning up token swarms. It's not the best against Humans, but Declaration can be good against Jund when they play multiple creatures. I've been very impressed in my testing.
Seeking Answers
I will be the first to admit I may be reading too much from the apparent stability. There haven't been many events since the Pro Tour that were just Modern. It's been mostly team events and those don't often drive innovation or provide accurate metagame data. Once GP Vegas happens, it may be clear that the metagame has dramatically shifted. In the meantime, I encourage you to challenge the accepted wisdom of this metagame. Humans is a powerful deck, but it's still just a pile of creatures. Prepare correctly and it can be easily picked apart.
One of the more intriguing developments here is Nameless Inversion, especially since Tarfire is generally just straight-up better at the same thing in red. It even goes to the dome and kills planeswalkers, while Inversion whiffs against plenty of Modern decks—not to mention costs twice as much! Sure, Inversion kills x/3s like Mantis Rider, which are plentiful in this metagame. But in that case, isn't Lightning Bolt worth inclusion despite not growing Goyf astronomically?
Relative newcomer Reckless Rage makes its Modern debut here, acting as an instant-speed Flame Slash in conjunction with any of the deck's creatures. With Lightning Bolt Modern's most-played removal spell, 
Despite its control affectations, UR Swans is still a combo deck at heart, churning through its library and slinging removal and permission until it can string together a kill. It attacks disruptive opponents from a relatively unique angle, as its namesake combo piece helps the deck stock back up on cards should opponents try to deal with it. The card advantage possible from hitting one's own Swans with a Lightning Bolt, combined with the pull-ahead graveyard exploitation of Bedlam Reveler, remove the need for Snapcaster Mage in this shell.
past, this was fine, because Merfolk's goldfish speed sat at 
Trickster can be used similarly to swing races, but its greatest ability is clearing out defenders. Tapping creatures may not be as powerful as removing them from play, but in a tempo deck, it can be functionally identical. The additional text after the tap ability is irrelevant in most creature matchups; critically, the creature will not attack or block for a whole turn, allowing Merfolk to swing through for the win.
In my opinion, this gives Trickster a literal fin up on Harbinger. Eliminating the critical enabler creature often cripples Storm or Ironworks. Storm doesn't strictly need a cost reducer to go off, however enabled kills come far easier. The same is true for Ironworks, but even more so: it is technically possible to win simply by chaining eggs with Krark-Clan Ironworks, but the deck is far more likely to fizzle without Trawler.
counters aren't very special against Jund or Jeskai. If the meta swings more toward combo, then Retort is definitely strong, but being weak against the most popular deck is a huge strike against the card. Also worth mentioning: Retort gets awkward around Mutavault, which counts as a Wizard but doesn't tap for blue.
