While there has not been many tournaments this past week other than the Meta Weekly 64, many league based competitions such as Clan Wars have shown the strengths and weaknesses of some decks and the Top Player Council has concluded after deliberation that the Tier List must reflect these findings.
Ancient Gears remain Tier 1 as they are the best control deck with sizable stats. With 3000 ATK and DEF Ancient Gear Reactor Dragon is difficult to deal with, compounded with the ability to ignore battle traps and monster effects. It often requires multiple resources to remove from the field in the event that the deck doesn't OTK first.
The Top Player Council has concluded that Koa'ki Meiru is deserving of Tier 1 status after their newest development. The use of KaibaCorp Bling has allowed Koa'ki to retain some of the consistency the deck had prior to the nerf. Equipped with glossy or prismatic Diamond Core of Koa'ki Meiru, Koa'ki Meiru players are able to draw diamond core after taking 1k damage or after using Cosmic Cyclone. Since most meta decks cannot consistently put 4000 damage on board on their first turn, many players are forced to not attack on their first turn in fear that their opponent will be able to kill them if given access to Diamond Core.
NOTE: Many TPC members are in agreement that Koa'ki Meiru is only Tier 1 with KaibaCorp Bling and is likely still Tier 2 with Sealed Tombs or The Tie that Binds Glossy and prismatic copies of cards are in no way guaranteed so pursuing this deck for the KaibaCorp Bling variant is cautioned greatly.
Koa'ki Meiru have seen a huge resurgence based in the KaibaCorp Bling skill, dropping Hey, Trunade! due to the limit, and playing Cosmic Cyclone to trigger KaibaCorp Bling to search Diamond Core of Koa'ki Meiru, while having access to Koa'ki Meiru Wall/Koa'ki Meiru Sandman for further negates. I believe this new way to play Koa'ki puts them firmly into a Tier 1 position. Traditional options to hurt Koa'ki Meiru are also under siege as Poisonous Winds is directly countered by Cosmic Cyclone and more decks are playing Koa'ki Meiru Rooklord. If the meta continues to focus on countering Ancient Gears as the top deck, expect to see Koa'ki Meiru stand above the rest for the remainder of that time.
KaibaCorp Bling Koa'ki is still the best deck in todays metagame. Having a guaranteed Diamond Core of Koa'ki Meiru after 1 Cosmic Cyclone is just insane, and very unhealthy for this game. After the nerf Koa'ki also has more room for techs like Skull Meister to deal with Ancient Gears and Dinos, or Floodgate Trap Hole / Sphere Kuriboh to win the mirror match. Sadly it has no real hard counter deck anymore so we have to see how the meta can deal with them.
Dinos remain Tier 2 as they are very consistent and can have explosive turns. What keeps them in Tier 2 and not in Tier 1 is their weakness to Koa'ki Meiru and how easy it is to counter them. Diamond Core of Koa'ki Meiru protects Koa'ki monsters from Survival's End and since dinos are not capable of OTKing on their first turn they cannot play aggressive without enabling Koa'ki to use KaibaCorp Bling.
Heroes and Amazoness remain Tier 2 on very close votes. One or both of these decks may see demotion after further meta development. The resurfacing of Koa'ki Meiru is a problem for both decks as they face many of the same threats after the banlist that they did before. It is difficult to tech for both Ancient Gears and Koa'ki Meiru since each deck requires different cards to beat consistently.
Dinos continue to be a consistent deck that is powerful in its own right, but a little easier to counter than the top decks. Hurt by Koa'ki Meiru banishing Diamond Core of Koa'ki Meiru as well as Sealed Tombs and common Ancient Gear counters in Skull Meister. The consistency and power of Dinos keeps it Tier 2 but the ease in it being countered keeps it from being Tier 1 with Koa'ki Meiru and Ancient Gears.
Destiny Calling Masked Heroes has a lot of solid match-ups across the board. With Dark City they can put a lot of pressure on the opponent without mask change. The attack boost is very relevant in this meta against Koa'ki, Dinos or Ancient Gears. Also, Heroes have room to adapt to the meta which makes them very versatile.
Presently there are no Tier 3 decks because there are no known decks that can reliably compete with the Tier 1 and Tier 2 decks.
Karakuri has been demoted due to their inconsistency against Ancient Gears, against Koa'ki Meiru, and in tournaments. While they may have the ability to draw through a large portion of their deck, the power of Karakuri has always been tied to the strength of tech cards in the meta. Ancient Gears are a difficult matchup for them so they may be tempted to run backrow removal, but running backrow removal against Koa'ki is essentially running dead cards. Karakuri are stuck between a rock and a hard place and will remain there until the meta changes.
Karakuri is demoted because they have a hard time in this meta. It has still a fast engine but it needs to open really well to compete with the meta. The other decks are more consistent and/or more powerful and Karakuri can't deal with all of them. Sadly it also loses a lot to itself, by bricking or losing the coin flip which makes it even harder for them to do well right now.