Disco Warlock, Tik Tock warlock, Quasar rogue, Boarlock, and Libram paladin.
Reasoning:
Disco warlock is currently at a 62.8 winrate Which points to it being too powerful. its also the most played deck in the game. If it was counterable( not a problem) it wouldnt be performing this well now.
Tik Tock warlock is currently wild modes premier and most played control combo deck. It stalls until it can acheive is quest then strips the opponents hand. usually winning the game from that point on. This sort of quest however feels very uninteractable. and a bit too easy to acheive. It would be nice to let other control decks breathe in wild and i think this deck is one of the largest offenders against that.
Quasar rogue is a deck that essentially plays solitaire until it combos the opponent. I really dont think having decks in the top tier like this is healthy for the game and from a gameplay point of view i think wild would be alot more fun without it.
Boarlock is again a stall until otk deck. that is yet another lightspeed like combo thats hard to interact with and feels very one sided when playing slower decks vs it. its very polarizing and unfun to play against and i dont think wild would miss it. The boar is the clear ban here.
Libram paladin might suprise some, being on this list. But having played tons of games with and against it ( like every deck ive mentioned in this post)I find the +3/+3 libram for 0 and it returning to your hand the problem. once the deck reduces libram cost to this point its almost unstoppable. it also has a 61.8 percent winrate, I think A nerf to libram of divinity so that it only returns to hand as a deathrattle would be alot more balanced. Otherwise that card especially with sunsapper is just too broken.
https://www.hsguru.com/meta?format=1&period=past_30_days&sort_by=total