In the wake of the most recent banlist there is now an entirely new meta to figure out. As of right now, there are the "safe" picks, which make up Tier 1, and then "the rest", filling out Tier 3 and High Potential. The absence of Tier 2 decks is not surprising, and will likely not last long as the best decks of "the rest" rise above the others.
The most obvious top decks of this new meta are the strongest decks from the previous one that did not get hit by the banlist. It is interesting to note, however, that both Ancient Gears and Dinos use lots of backrow and make heavy use of effects activated in the grave. Counters to both of these have already begun seeing use (cards like Cosmic Cyclone and Skull Meister, respectively), so it will be important to see if these decks can remain in Tier 1 with everyone's attention focused entirely on them.
Dinos rise to Tier 1 after the recent banlist. It is the control deck of the format with the ability to hammer down on the opponent's Life Points due to its hefty swingers and being able to use Survival's End aggressively as well as defensively. It is definitely one of the top contenders going into this new metagame.
Ancient Gears rise to Tier 1 as Koa’ki Meiru (its worst matchup) falls from its dominant position. Even in the event of Koa’ki Meiru remaining as a top tier contender, it is unlikely that it will be using The Tie that Binds as its skill of choice - making the matchup not as unfavourable for Ancient Gear as it once was.
Ancient Gears rise to Tier 1 thanks to a lack of a hit on the recent banlist, as well as their greatest adversary (Koa'ki Meiru) taking a banlist hit for the greater good of us all.
Dinos also make their way into Tier 1 thanks to having an above-average matchup vs Ancient Gears, their worst matchup (Koaki Meiru) taking a hit, and Survival's End being a force to be reckoned with. Survival's End allows access to the ability to dodge problem cards, swarm for quick OTK's, and remove monsters and backrow on the spot as needed.
There are no Tier 2 decks. With the meta still developing, it is not yet clear which of the Tier 3 decks will benefit the most and push its way into Tier 2.
Buster Blader and Vampires have been demoted to Tier 3, victims of both the banlist and a shifting meta. Buster Blader has had its best skill, Last Gamble, severely nerfed and its worst match-up (Ancient Gears) is now a Tier 1 deck. Additionally, one of its favorite fusion targets, Koa'ki Meiru Maximus, is now on the Limited list. Vampires must now be built with less ways of playing through backrow (now that Samurai Skull is Semi-Limited) in a backrow-heavy meta, on top of losing (at least some) access to Enemy Controller. Additionally, the rise of Sealed Tombs and Skull Meister make it even harder for Vampires to get rolling.
Karakuri has remained in Tier 3. A poor Ancient Gear match-up holds the deck back but its ability to side well will always be relevant until Karakuri Anatomy ends up on a banlist.
Even though DNA Surgery remains at 3, Buster Blader is no longer able to benefit from many Koa’ki Meiru opponents pushing it through a tournament. Though the deck is not anticipated to entirely fall off yet, its conversion rates are expected to plummet in comparison to its previous results.
Koa'ki Meiru has been moved to High Potential as the deck is re-built. No longer a terrifying OTK machine, Koa'ki Meiru still has strong competitive potential and will likely return to the Tier List once updated builds start seeing more play. Additionally, Masked Heroes have been added to High Potential for this new meta. Abusing Cosmic Cyclone is very powerful right now, and Masked Heroes have always been able to do that better than most other decks thanks to their potent offensive firepower with Mask Change and Offerings to the Doomed.
Koa'ki Meiru decks under the new banlist do not yet feel fully optimised. Due to both this and lack of tournaments with the banlist in effect, the deck will remain as High Potential for now though demotion is not forseeable.
Lavals have been removed from High Potential. Losing Last Gamble hurts the deck quite a bit, and new builds (likely based either on Reinforcements or KaibaCorp Bling for easier Laval Cannon access) will have to be developed for Lavals to make another push at the Tier List.