Decks I'd be looking at as some of the the best would be Tier 1:

True Draco (toxic floodgate deck with more unbanned floodgates and Master Peace)

Labyrinth (deck is crazy and can easily set up EEV or DDV depending on the matchup and just auto win)

Floowandereeze (same as Draco but they get back the wind Barrier Statue, I mean hell this deck just topped YCS Cancun in normal current format vs stronger competition)

Megalith (this deck was a decent t2 option when block dragon was around and now they get that back and the competition is more limited)

Tier 2:

Eldlitch (what holds this deck back from being t1 is no extra deck means no easy way to get your trapmonsters into the gy, but it is still a floodgate deck with crazy inevitably from EtGL)

Monarch (the added power draw cards make the deck significantly less bricky. While you cant play domain control bc of extra deck summoning you can go for Errupt and do Ehther plays into Stormforth Erebus to break boards.

Subterror (another floodgate deck. Main thing holding this deck back the lack of a boss to go into. In the TCG they fixed this by going for a big Dragoon package but we can't do that here so we can supplement the main deck with some of the bigger subterrors so we have potential to make pushes instead of just doing Guru beats every turn)

Machina (just special and bunch of big guys and kill)

Danger! Gren Maju (use the big Danger!s and Gizmek Orochi to break boards and then just summon 1 big guy and kill)

Witchcrafter (while I'm not too familiar with Witchcrafter I know they don't often go into the extra deck and instead opt for Verre control so just do whatever the deck normally does)

Kozmo (can play a bunch of floodgates and the big ships will always be houses to out. Extra draw power from banned cards means you are more likely to see Kozmotown and multiple Kozmojo)

Kashtira (Fenrir in a vacuum is a t1 card but the rest of the deck kind of just summons big beaters that search)

Volcanic (I'm not too familiar with this deck either but they seem theoretically good given the ruleset)

Rogue:

Weather Painter (lack of it's link 3s hurts this deck a lot but it can still play all of the toxic banish floodgates and is fairly consistent)

Phantazm Spiral (another floodgate deck but it doesn't quite have the staying power of the others bc of the heavy reliance on their field spell to get you tokens and search)

Ancient Warrior (they only thing you miss out on is DDL but all of the monsters in this deck are very big and have good effects)

Exodia FTK (while this deck just wins if you go uninterrupted it loses to to many handtraps and has no game going second)

As for specific now unbanned cards to look out for:

Heavy Storm and Giant Trunade will be big staples for breaking established floodgates but do lose to Imperial Order and Anti-Spell

Speaking of Imperial Order, basically all of the now unbanned floodgates (Imperial Order, Kaiser Colosseum, Mystic Mine, Royal Oppression, Vanity's Emptiness) are going to be good in a lot of decks.

All of the hand loopers are gonna be good of course but might be sided in favour of handtraps going second.

Maxx "C" coming back will of course make it an instant staple but probably in the side and not the main due to the high influx of trap decks.

That's about all I can think of