Over the past year, almost every premier set that has been released had major implications for Constructed formats, even beyond Standard. The introduction of Wilds of Eldraine brought us
Up the Beanstalk


Meanwhile, Murders at Karlov Manor completely shook up the metagames of both Pioneer and Modern.
Vein Ripper

Ward—Sacrifice a creature.
Whenever a creature dies, target opponent loses 2 life and you gain 2 life.
is an amazing payoff for the Vampires deck in Pioneer, and the combination of
Leyline of the Guildpact

Each nonland permanent you control is all colors.
Lands you control are every basic land type in addition to their other types.
and
Scion of Draco

Flying
Each creature you control has vigilance if it's white, hexproof if it's blue, lifelink if it's black, first strike if it's red, and trample if it's green.
is still a force to be reckoned with.
Outlaws of Thunder Junction released quite recently, but it appears as though this set follows a similar trend. For instance,
Slickshot Show-Off

Whenever you cast a noncreature spell, this creature gets +2/+0 until end of turn.
Plot {1}{R} (You may pay {1}{R} and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)
is a clear multi-format all-star right from the jump. If that weren’t enough, a rather innovative Artifacts shell in Legacy making use of two different Thunder Junction cards won a recent Magic Online Legacy Challenge! Given the vast card pool already available for Legacy players, this unique deck is certainly worth looking into.
New Cards Play a Major Role

Before Outlaws of Thunder Junction, blue-based Artifacts shells in Legacy were hanging on by a thread in the metagame. Eight-cast decks utilizing the power of
Thought Monitor

Flying
When this creature enters, draw two cards.
and
Thoughtcast

Draw two cards.
had fallen out of favor a bit.
Patchwork Automaton

Whenever you cast an artifact spell, put a +1/+1 counter on this creature.
was clearly still a powerful card in conjunction with zero-drop Artifacts, but decks were a bit too reliant on the potent two-drop to close the game.
Well, that was all about to change with the printing of Simulacrum Synthesizer. Simulacrum Synthesizer has the ability to churn out a multitude of massive tokens. If you’ve ever played against
Urza’s Saga

I — This Saga gains "{T}: Add {C}."
II — This Saga gains "{2}, {T}: Create a 0/0 colorless Construct artifact creature token with 'This token gets +1/+1 for each artifact you control.'"
III — Search your library for an artifact card with mana cost {0} or {1}, put it onto the battlefield, then shuffle.
, you know just how big these Construct tokens can get, and this deck utilizes both Construct makers. The difference, though, is that Synthesizer has the potential to make a bunch of Construct tokens all in the same turn!
Similar to Modern Affinity builds, this deck plays a high density of efficient Artifacts, just with significantly stronger options. Beyond just enabling Patchwork Automaton, cards like
Mox Opal




Artifact landcycling {2} ({2}, Discard this card: Search your library for an artifact land card, reveal it, put it into your hand, then shuffle.)
cost as little as possible.
Seat of the Synod

Notably, Simulacrum Synthesizer isn’t the only new Artifact to make an appearance.
Lavaspur Boots

Equip {1}
appears as a one-of in this decklist, primarily as a tutor target for Urza’s Saga. While it may be just a one-of, its ability to provide Haste to one of your massive Constructs can provide a huge swing. Its cheap Equip cost of only one mana makes it easy to move around on future turns. Tack on a power buff and Ward 1, and you’ve got a lot of upside built into these Boots.
Read More: Popular MTG Commander Content Creators Announce New House Bans!
Thunder Junction Meets Warhammer

Where this deck starts to separate itself even further from Modern Affinity builds is with its inclusion of some fantastic three-drop Artifact Creatures from the MTG Warhammer set. After a long waiting period, Warhammer cards have just recently made their way onto Magic Online. From
Triumph of Saint Katherine

Praesidium Protectiva — When this creature is put into your graveyard from the battlefield, exile it and the top six cards of your library in a face-down pile. If you do, shuffle that pile and put it back on top of your library.
Miracle {1}{W} (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)
to
Chaos Defiler

Battle Cannon — When this creature enters or dies, for each opponent, choose a nonland permanent that player controls. Destroy one of them chosen at random.
, these cards have quickly begun making their presences felt.
The first Warhammer card this deck features is
Skorpekh Lord

Command Protocols — Other artifact creatures you control get +1/+0 and have menace.
Unearth {2}{B} ({2}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)
. Skorpekh Lord simply does everything this deck wants. It grants a form of evasion to all of your massive Constructs. It triggers Synthesizer when you cast it or Unearth it. The only downside is that it costs three mana, but in Legacy, this is hardly a problem. Mox Opal and Lotus Petal make it trivial to cast this card early, even without a Land in play that produces black mana. Add in the almighty
Ancient Tomb

That brings us to the second Warhammer card:
Sicarian Infiltrator

Squad {2} (As an additional cost to cast this spell, you may pay {2} any number of times. When this creature enters, create that many tokens that are copies of it.)
Benediction of the Omnissiah — When this creature enters, draw a card.
. Sicarian Infiltrator is a neat mana sink that works exceptionally well with Synthesizer. At minimum, Sicarian Infiltrator is a three-mana 1/2 that draws a card when it enters. However, if you have excess mana lying around, you can use its Squad ability to have it create extra copies of itself when entering play. Importantly, each copy that enters the battlefield has a mana value of three, so each copy will trigger Synthesizer as well.
Read More: MTG Thunder Junction Planeswalker Gives New Life to Mediocre Suspend Card!
Bigger and Better

The addition of Synthesizer, Lavaspur Boots, and a couple elite Warhammer cards have given the Legacy Patchwork Automaton archetype a new identity. Rather than relying heavily on synergies between
Urza’s Bauble


When Emry enters, mill four cards.
{T}: Choose target artifact card in your graveyard. You may cast that card this turn. (You still pay its costs. Timing rules still apply.)
to pull ahead, this deck consistently puts a ton of extra pressure on the opponent.
Being able to Flood the board with Constructs helps a ton in Creature-heavy matchups. You are also a little less vulnerable to
Orcish Bowmasters

When this creature enters and whenever an opponent draws a card except the first one they draw in each of their draw steps, this creature deals 1 damage to any target. Then amass Orcs 1.
and
Chalice of the Void

Whenever a player casts a spell with mana value equal to the number of charge counters on this artifact, counter that spell.
for X=0.
The one area this deck gets a little weaker in is disrupting fast combo decks. Interestingly, this deck plays four copies of Force of Will in the sideboard, not in the maindeck. At first glance, this may seem like a wild choice to make. However, it makes sense considering how few blue cards this deck has to pitch to Force. There are no copies of Emry, Thoughtcast, or
Kappa Cannoneer

Ward {4}
Whenever this creature or another artifact you control enters, put a +1/+1 counter on this creature. It can't be blocked this turn.
to be found here. The only blue cards in the maindeck are Infiltrator, Thought Monitor, and Synthesizer, the last of which you really don’t want to pitch to Force.
By cutting Force of Will from the maindeck, this deck gets to play even more Artifacts to help fuel the Synthesizer/Automaton gameplan. As such, you’re main gameplan is bolstered, and you can still side in Force of will for games two and three when necessary. You will feel the cost against strategies like
Doomsday

At the end of the day, there’s no denying the elite performance this archetype put up. The Thunder Junction cards undoubtedly played a large part in the deck’s success. If you’re looking to play Legacy in the coming weeks, it might be worth packing some extra hate cards like Null Rod. This deck is powerful and will run you over if you’re not prepared.
Read More: Tournament-Winning MTG Deck Reveals Busted Thunder Junction Card!