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While I've been durdling around writing theory pieces on phases, Modern has been chugging right along... with a vengeance. The last week alone has showcased so much piping-hot technology I had to split this article down the middle while writing it. Today, we'll take a look at six of the most exciting decks to emerge (or resurface) since Dominaria's sanctioning.
A Mox Is a Mox
Mox Amber has rightfully found itself the center of much debate among Modern pundits—after all, it is a Mox. And if any non-Vintage format is defined by access to fast mana, it's this one.
In my own article on the card, I asserted that Mox Amber would see Modern play, but expressed doubts about how quickly; I felt too few powerful, cheap legends existed for pilots to make the most of the card, and assumed Amber would make the biggest splash in combo decks that could use the ramp. In other words, I mostly discounted the murmurings of a Boros-colored aggro shell featuring the card, figuring people's minds prematurely jumped to the color combination for its wealth of cheap legends without remembering that Modern creatures have to actually be playable. It turns out the bar for creature playability drops drastically when the payoff is including a Mox, something I maybe should have known from slinging Eldrazi Temple.
Strike While the Bell is Hot
This first deck employs a host of white and red one-drop legends to turn on its four Ambers right away, letting it ramp into Goblin Rabblemaster and Hazoret the Fervent a turn early.
Boros Legends, by AKMID (5-0)
This deck plays enough one-drops to ensure an active Amber on turn two, and boasts multiple payoffs for achieving such a game state. That's the kind of focus I look for in new Modern decks. It's also compact enough to run some of the format's better interactive cards, including a set of Lightning Bolt, and makes great use of Smuggler's Copter—the deck's weaker creatures can at least crew the ship, which chews through redundant legends (especially Amber itself).
Out of the sideboard, Boros has access to Blood Moon and Rest in Peace, two of Modern's nastiest hosers. Moon seems especially good with Amber, which accelerates into the costly enchantment.
'Til Death Do Us Part
Mox Amber also showed up this week in a mono-white aggro deck. Death & Taxes has been a part of the scene for some time now, enjoying a sort of renaissance after Brian Coval decimated a field of Eldrazi Tron and Grixis Shadow at the SCG Invitational last summer. A strategy already mana-hungry enough to warrant a set of Aether Vial, Taxes seems like a great fit for the new Mox.
Death & Taxes, by SPIDERSPACE (5-0)
Death & Taxes shines brightest when its lands are free to attack the opposing manabases as Aether Vial keeps the hits coming. Should Aether Vial die, the deck sometimes struggles to disrupt and pressure opponents adequately. Mox Amber partly addresses this issue as another producer of extra mana, granting the deck some much-needed redundancy by filling a slot sometimes plugged by Noble Hierarch in GW builds.
To accomodate the Mox, Death & Taxes must swing more aggro, which isn't necessarily so bad in Modern. In practice, that means one-mana, two-power creatures abound in this list. I like moving to 4 Kytheon here (from 3 in Boros Legends); it's an obvious removal target and the strongest legend at this price point, so occasionally drawing multiples doesn't hurt too bad. And while Death & Taxes generally prefers creatures that mesh with its goals, the one-mana beaters still enable that plan by again crewing Smuggler's Copter, which digs into the right pieces.
These white aggro decks seem like fine starting points for Mox Amber, and I can't wait to see the card enable other aggro decks as we receive more cheap legends. Decks in this vein have always been a tad fair for Modern, and I'm happy they're getting the tools they need to level up.
It's a Bomat World
Bomat Courier has gently impacted Modern in a couple ways since its release, first inhabiting a short-lived Affinity shell and then helming the newest banned-in-Standard deck to rear its head here, Bomat (formerly Ramunap) Red. But Courier's not finished—the card continues to show up in winning lists.
Soul Survivor
Andreas Schulte's "Soulflayer Surprise," from GP Lyon a few months ago, isn't much of a surprise anymore. But Bomat Courier has found its way into the deck, and looks to be there to stay. This new build uses Courier to dig into combo pieces, discard fatties, and give Souflayer haste—all while incentivizing opponents to keep in their cheap removal after siding, which further improves the deck's namesake card.
Soulflayer Surprise, by YUSEIMAX (5-0)
Adding Courier to the rock-solid consistency package of Faithless Looting and Traverse the Ulvenwald gives Soulflayer a frightening amount of velocity for a Jund-colored combo deck, and increases the odds of seeing sideboard bullets like those shiny new Damping Spheres.
No New Friends
Another old deck to receive the Bomat treatment is 8-Whack, an aggressive tribal deck that makes big attacks with Goblin Bushwhacker and Reckless Bushwhacker before using Goblin Grenade to close out games. While Courier isn't a Goblin itself, it meshes well with the deck's gameplan of dumping its hand as fast as possible, and gives 8-Whack some mid-game staying power. The same can't be said of Dominaria's freshly-sanctioned actual Goblins, which fail to make the cut here.
8-Whack, by MAGIC_AIDS (5-0)
When it comes to staying power, Courier gets a hand from The Flame of Keld, a Dominaria newcomer that slots in here at 4. In my Dominaria spoiler review, I expressed mixed feelings about the card in Burn, its obvious does-it-go-here deck; Burn wants a critical mass of cards that do the same thing, and Flame does something else. But the enchantment seems right at home in 8-Whack, where it gasses pilots back up on resources after they commit to the board. In this slower metagame, boasting cheap avenues to card advantage is a huge boon for such all-in strategies.
Architects of Goodstuff
Last on the agenda are a couple decks wielding Architects of Will, ex-Living End staple and delirium-enabler extraordinaire. Unlike the card's initial home, these decks are strictly fair, and use Architects to pump up Traverse the Ulvenwald.
Slow and Steady
Traverse Shadow's no longer a breakout deck by any means, but it's certainly one that keeps up with the times. This Shadow deck lacks the late-game power of Snapcaster Mage, seemingly making it preferable for faster metagames; while players have traditionally adjusted for this quirk with a white splash for Lingering Souls and Ranger of Eos, ANEMU's build tweaks the deck's very core to make it slower and steadier.
Traverse Shadow, by ANEMU (5-0)
Architects of Will replaces 2 Mishra's Bauble in this build, a stark departure from what we've known to be standard fare for Traverse Shadow since the deck burst onto the scene a year ago. This build isn't looking to turn on delirium so quickly, instead valuing the additional card types Architects provides on its own.
ANEMU also includes a Dominaria card in his mainboard: Cast Down. In hindsight (20/20 as always), I'm not sure how this card was able to fly under the radar; it's clearly one of the least restrictive "Doom Blades" we've gotten so far, and I understand including it over the color-hungry Terminate here. Also removal-related, ANEMU splits Fatal Push with Dismember, a choice that works well with Tarfire. With both Shadow and Goyf feeling their fittest, Temur Battle Rage improves dramatically.
Return to Castlevania
I'm no stranger to four-color Delver decks, nor to thresh shells in this color combination. But KIIIITTYMAN's BURG Delver still had me doing double-takes.
BURG Delver, by KIIIITTYMAN (5-0)
There are some things I understand about this deck, and some I don't. Bedlam over Snapcaster for card advantage, letting us play the blue-heavy Deprive instead of Mana Leak? Sure. Flayer over Goyf, so as not to over-rely on the graveyard? Makes sense. All those color-hungry black spells over their isn't-this-as-good analogs in a 17-land deck that stretches unflinchingly into four colors? Lost me.
There's still enough savvy deckbuilding here to tempt me into taking BURG Delver for a spin. For instance, Architects of Will does more than Bauble for the in-deck card economy—Delver of Secrets requires a critical mass of instant and sorceries, and Will offers double the card types for the same number of slots. And I love side-stepping graveyard hate and Blood Moon at once with the full set of Young Pyromancer.
The Never-Ending Format
And so ends our partial journey through a week of attention-grabbing 5-0s. Do you think these decks have legs, or are they flashes in the pan? Have you noticed any great brews running around that I've missed? Drop me a line in the comments, and I'll respond—that is, if I can manage to tear myself away from playing this impossibly diverse format!
People have tried Blood Moon in other fair midrange decks before—namely Jund—but it has never been quite as smooth. There are a couple reasons why I think it pales a bit in comparison, but the most relevant in my eyes is the presence of Faithless Looting in Mardu. One of the best cards in the format, Faithless Looting solves nearly all problems. I will almost never mulligan a hand with a red source and a Looting, and I can't count the number of times I've said, "Well if I just draw a Looting here..." It lets you discard those Lingering Souls that you couldn't cast anyway and sets up well for your Bedlam Reveler. It keeps you from flooding out when you flash it back in the late game. It does everything! Certainly, it is the linchpin that holds the deck together.
Sphere's second ability hoses Storm, counting all the spells that a player has played in a turn and taxing them accordingly. This ability also targets combo decks that play a critical mass of spells to win, and boasts subtle
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The sad fact is that, unlike with some hate cards, affected decks can brute-force their way through Sphere. Ironworks can partially go off a few turns in a row to build up enough artifacts and draw enough cards so they can win while only playing a few spells; Ad Nauseam only needs to resolve two spells to win. Storm is more strongly affected, but they too can string small Grapeshots together over a few turns.
Furthermore, there's the question of Abrade. I wager Abrade's quite good for Tron and Storm even now, considering how effective it is against Humans. I played Storm for a few weeks months ago and wished I had room for a full set in the mainboard, they were so powerful. 
Sphere, and especially with Empty the Warrens. Furthermore, Sphere is symmetrical. Storm can force opponents to play multiple spells in a turn and get hit themselves, leaving Storm a window to remove Sphere and go off.
Damping Sphere is never going to be as devastating as a true hoser. Blood Moon and Rule of Law are far more powerful and effective than Sphere. There is something to the argument that Sphere's flexibility makes up for this lack of definitiveness. However, this is weakened by the fact that common answers completely defeat the Sphere. If Sphere forced targeted decks to drastically change their sideboarding to reflect its existence, that would be one thing; however, that isn't the case, and so I cannot recommend the Sphere as a silver bullet. It's a hoser that doesn't actually hose decks, and so most decks should leave it at home.
