The TCG's famously, and infamously, introduced many of the game's most powerful cards and themes, including Nibiru, the Primal Being, Tour Guide from the Underworld, Maxx "C", Burning Abyss, and Kozmos. Those cards completely changed the competitive scene when they arrived, and years ago they widened the gap between the OCG and TCG metagames.

Nowadays the OCG's now caught up on all but the most recent World Premieres, and in some cases even improved on them: Burning Abyss was boosted by the OCG-first Beatrice, Lady of the Eternal, while Subterrors had to wait a while to get Subterror Guru here in the TCG.

Format-defining World Premieres have helped make competitive Yu-Gi-Oh a more interesting place. Asia's Yu-Gi-Oh OCG isn't a crystal ball that can predict every upcoming twist and turn in the coming format, and that's thanks in part to the cards that debut in the TCG.

Of course, not all World Premiere themes are winners. Vendreads, Noble Knights, U.A.s, Dream Mirrors, Myutants, Plunder Patrolls, and even early Subterrors were, or still are, casual strategies for the most part. But this week we're looking at the decks that stood out from the competition; decks that dangerously pushed the envelope on what a World Premiere theme should be capable of.

#5 - Guru Leads Subterrors Aboveground

I know that I just finished mentioning that Subterrors weren't a competitive theme until Subterror Guru was brought to the TCG from the OCG. That said, I think Subterrors were probably better out of the box compared to a lot of other World Premiere themes, and I'd put them on this list even if I ignored Subterror Guru entirely.

In 2016, flip effect strategies were well on their way out, but Subterrors had enough reactivity to avoid being pigeonholed into a narrow 'set all your cards and wait' strategy. That's all thanks to Subterror Nemesis Warrior's excellent Quick Effect, and its ability to act as a Gladiator Test Tiger, Madolche Anjelly, or Lonefire Blossom for an entire theme–with some caveats, of course.

The Hidden City still a key component of modern Subterror decks, and it's not just because it has a search effect. There's a huge amount of utility in The Hidden City second and third effects, letting you effortlessly control the battle position of your monsters.

The Field Spell's third effect forces your opponent to deal with your monsters or The Hidden City itself before making an attack in the Battle Phase, and in a simplified duel the Subterror player can defuse attacks turn after turn while triggering their other Subterrors. There's a surprisingly solid engine in the very first batch of Subterror cards, but unfortunately the deck didn't receive another must-play until much later.

By the time Subterror Guru came around it was clear that the rest of the deck, which largely revolved around Subterror Nemesis Warrior, was simply suboptimal by comparison. Subterrors are still played today, and the majority of the theme's cards first debuted in the TCG.

#4 - Kaijus Eat Everything

The 2015 release of Kaijus and Kozmos in Clash of Rebellions set the stage for a face-off between heavily armored spaceships and monsters that could simply eat them whole.

That showdown happened often in competition, but Kaijus were never played as a dedicated strategy. Instead, players added them to just about everything else as Main or Side Deck tech. Gameciel, the Sea Turtle Kaiju one of the most important cards released in the last decade, and it'd likely continue to see play today if not for a tremendous power creep in the form of Nibiru, the Primal Being and Forbidden Droplet.

Kaijus arrived at exactly the right time. Kozmos were gearing up with monsters that benefited from destruction and were immune to targeting effects, and Burning Abyss were still relatively popular a year after their own debut. Planting a Kaiju on your opponent's Burning Abyss board meant their Malebranche cards would self-destruct, and eating a Kozmo ship would put their cards in the graveyard and out of reach of Kozmotown.

Later, Interrupted Kaiju Slumber would become one of the top board wipe effects in the game. Interrupted Kaiju Slumber eventually found itself on the Forbidden & Limited List, and for good reason. Kaijus used to be everywhere in Yu-Gi-Oh, but today you're much more likely to see them in a movie.

#3 - Kozmos Add Sci-Fi To Oz

Remember that time Yu-Gi-Oh introduced a theme that was half Star Wars and half The Wizard of Oz? Kozmos feel like the product of a fever dream that lasted for nearly a year across 2015 and 2016. Strangely, they never received any support outside of the first four sets they debuted in, and they've never received a single piece of OCG support.

It's not like Japan isn't big into Star Wars: there are plenty of nerds everywhere. Do yourself a favor and research early 80s animation in Japan–it's loaded with Star Wars references.

Kozmos were quickly picked up as a competitive strategy and hit their peak when Kozmo Dark Destroyer arrived in Dimension of Chaos. Kozmo Dark Destroyer was everything a boss monster needed to be at the time: immune to targeting, 3000 ATK, a built-in removal effect, and an ability that replaced it with another monster if your opponent managed to destroy it.

The rest of the Kozmo deck was backed up with solid synergies and a line-up of great monsters. Kozmos just kept getting better and better until a mix of restrictions on the F&L List and general power creep pushed the deck out of competitive play. Today the entire deck's unlimited, and many of the strategy's key cards are still valuable despite reprints in 2016's Infinite Gold.

#2 - SPYRAL Absolutely Dominates With A Little OCG Help

Okay, I might be cheating with this one. SPYRAL in its TCG-exclusive form probably doesn't earn a spot on this list, so we're really only talking about the deck after SPYRAL Double Helix.

I don't think the addition of a single themed Link changed any strategy as much as SPYRALs were changed by SPYRAL Double Helix. It completely revolutionized the deck by transforming the theme's worst cards into combo starters, and introducing a much-needed stepping stone for the deck's biggest monsters. SPYRAL Double Helix is the reason why any SPYRAL cards are currently on the F&L List, ahough admittedly Magicians' Souls might have played a role too.

SPYRALs delivered insane boards, effortless field presence, and exactly the kind of explosive power that decks needed to compete in the early Link era. SPYRAL players were dumping a huge number of cards on the field with 2-card combos, while World Chalice players were still figuring out the 3-card combos needed for their extremely fragile final boards.

What set SPYRAL apart from the competition was its ability to combo off with very few cards, and the excellent defensive set-up of SPYRAL Sleeper and SPYRAL Resort. Remember that SPYRALs were huge at a time before negation body Link Monsters like Apollousa, Bow of the Goddess existed; SPYRAL set-ups were among the best in the game.

#1 - The Unending Burning Abyss

Duelist Alliance set the new norm for power creep by introducing a handful of strategies whose motto was, "we have unlimited cards and destroying us won't make a difference."

In a way, I think themes like Shaddolls and Burning Abyss were continuing the escalation that started with Dragon Rulers, by redefining what terms like 'floater' meant. Cir, Malebranche of the Burning Abyss and Dante, Traveler of the Burning Abyss don't just have self-replacing effects: they form an infinite loop of unending card advantage that your opponent might actually be powerless to stop.

The era before was completely different, where if you destroyed enough Fire Hand or Ice Hand, or Geargiarmor, or Traptrix Dionaea, your opponent would eventually run out of cards. That wasn't the case with Burning Abyss, and players figured that out quickly.

Burning Abyss launched with Dante, Traveler of the Burning Abyss under $25 each, but when the first tournament results of the post- Duelist Alliance format rolled in it was clear that Burning Abyss were a top deck-to-beat along with Shaddolls. The deck just kept getting better with each new release, and with Farfa, Malebranche of the Burning Abyss at their disposal there was very little that the deck couldn't handle. Except, of course, monsters that couldn't be targeted.

Qliphorts and Nekroz presented Burning Abyss with two new challenging match-ups, but Dante, Traveler of the Burning Abyss outlived them all. Burning Abyss has continued to be one of the game's most popular strategies since it launched in 2014, even if it's rarely one of the format's top picks. It's hard to imagine another World Premiere theme that's had a bigger impact on the game as a standalone strategy.

These five themes are just a small slice of what the TCG's introduced to the game. Let's not forget that Maxx "C" alone is arguably more impactful than any deck in Yu-Gi-Oh's history. The "C" cards are technically a theme, but, well, the first members debuted in the OCG.

Hey, I tried to make it work, seriously!

Anyways, these are my Top 5 World Premiere themes, though I bet you might have your own list. Let me know on facebook or twitter what your ranking looks like.

Until next time then