Welcome back to another Friday Market Watch! As we count down the hours to YCS Bochum over in Germany, we'll count down the Top 10 bestselling singles in the TCGplayer marketplace from Monday to today.

That means we'll look at the ten cards that sold the most copies across all rarities and editions, regardless of price. So if a key common or rare outsells a big foil? The less expensive card makes the Top 10, and the more prized one might not. Looking at overall sales volume lets us make better reads on what decks could be big moving forward, and what new releases players are responding to. When dozens of an Ultra Rare or Secret Rare sell in a short period of time, it really could be for any reason, including speculation. But when hundreds or thousands of a non-foil move, it often suggests a tech trend or potential swing in the popularity of a major strategy.

The story since Destiny Soldiers dropped has been pretty simple: Darklords sold in droves until supply of Darklord Ixchel and Darklord Nasten dried up, driving up their prices. From there we saw a sudden upswing in demand for Abyss Actors that's lasted a couple weeks, while Allure of Darkness, Trade-In, and Destiny HERO – Malicious have remained huge sellers. But aside from the draw cards, those trends started to slip last week, and we saw Metalfoes and Yang Zings start to rally.

Here's the fallout of the last four days of sales.

#10: Paleozoic Opabinia

After a lot of jockeying between Hero, Mermail, and Lightsworn builds featuring Toadally Awesome, Paleozoic Frogs has finally started to take its place as one of the format's truly dominant strategies. That rise in success appears to've sparked a bit of a rise in demand, as Paleozoic Opabinia – generally seen as a three-of in most Top Cut builds – reached the Number 10 spot this week.

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#9: Abyss Actor – Evil Heel

Abyss Actors slipped this week, but they still managed to hang onto no less than four slots in the Top 10. Evil Heel reprised its Number 9 showing last week, remaining in the exact same spot.

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#8: Abyss Actor – Wild Hope

Meanwhile the strategy's ace card fell from Number 3 on Monday to Number 8 today, likely reflecting a flagging interest in Abyss Actors on the whole. Abyss Actor – Wild Hope is a must-run at three per deck, instantly turning any other Abyss Actor into a complete Pendulum Scale and letting you Pendulum Summon Abyss Actor – Evil Heel. It searches, it attacks, it sets up your biggest Special Summons, and its collapse in demand isn't much of a surprise. It's kind of a wonder that Abyss Actors remained so hot for so long.

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#7: Polymerization

New support for Frightfurs and Fluffals just keeps rolling out in the OCG, and that anticipation combined with numerous other factors launched the original Fusion Spell into the Top 10, as Polymerization popped in at Number 7. Was this really a function of upcoming releases, or just nostalgia in the wake of Polymerization's recent reprintings mixed with some holiday enthusiasm? We'll probably never know for sure, but it was likely a blend of both factors.

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#6: Abyss Actor – Sassy Rookie

Back on the thespian side of things, Abyss Actor – Sassy Rookie fell from Number 5 to Number 6 this week, which is still kind of surprising; Sassy Rookie's often regarded as too slow for competitive builds of Abyss Actors. The card's popularity may be owed to Jackie Bernal's recent build of Abyss Actor Metalfoes, which was covered a little while ago on Jon Moore's House of Champs Youtube Channel.

If there's another explanation, I don't know what it is.

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#5: Abyss Actor – Superstar

Our final Abyss Actor in the week's Top 10 was another two-of in Bernal's list: Abyss Actor – Superstar. That said, Superstar's much more common in the average Abyss Actor deck, so it makes sense to see it at Number 5.

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#4: Mirror Force

More surprising, Mirror Force is inexplicably one of the top-selling cards of the week! Seems like more nostalgia.

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#3: Retaliating "C"

Blowing up at YCS Anaheim, Retaliating "C" was one of the most popular Side Deck choices at the YCS and had a breakout showing that saw it evolve from a common Metalfoes pick to a candidate for a wide range of strategies. Doug did an awesome job Spotlighting Retaliating "C" earlier this week, and if you're not playing it yet yourself, definitely check out that article. It probably still has legs through the coming weeks of competition.

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#2: SPYRAL Super Agent

Why was SPYRAL Super Agent a huge seller? No idea! If you have theories or answers, let me know down in the comments.

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#1: Interrupted Kaiju Slumber

And finally, Interrupted Kaiju Slumber exploded this week to surge ahead of every other card in the TCGplayer marketplace.

Kaiju made a few notable impacts the past two weeks. A Kaiju Blue-Eyes White Dragon topped the recent Glasgow Regional Qualifier in Scotland, and similar decks have seen success lately in Japan. But the card's biggest claim to fame is its rise to power in Zoodiac, the new theme from Raging Tempest that's been crushing competition overseas since its debut. You can check the most recent deck lists over on The Organization to see what I'm talking about: they recently logged nearly 50 Zoodiac decks that were successful in tournaments, and about 20% of them ran Kaiju engines.

While Interrupted Kaiju Slumber has been about a buck for most of its run, its Market Price is pushing the $2 mark, and the most affordable copies on the TCGplayer marketplace right now are over four dollars. With Raging Tempest still two months out, the card's sitting on an upwards price trend as players scrabbled for their copies and dealers stocked up, making it the Number 1 bestselling card of the week.

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And that wraps up the week! We'll be back on Monday with another look at a new list of bestsellers, coming off the final Yu-Gi-Oh! Championship Series of the European season, YCS Bochum. Will that Championship shake up the secondary market?

We'll find out in our next Market Watch.

-Jason Grabher-Meyer