Obvious bans, just give way too many points for way too little:
Will probably be a really obvious ban once players are more familiar with them, but i'd be willing to play more with these cards:
Craft teacher / Artisan district: both of these encourage kindof risky major rushing strategies, and they have an outsized reward for it, but people are going to throw their games to them for a while because major rushing doesn't work if it's everything your game does.
Autumn mother: It seems manageable to fight, albeit strong, in early-mid grow. Managing to have enough food and building resources to really exploit this vs non-late grow games seems rare. That said, the game I played with this I came second to a carpenters parlor player, so it's probably bannable just for being consistent growth shenanigans (in a way that no other card on BGA is) and warping the game towards grow, even if the player playing it isn't always the one who benefits the most (although growing in round 4 in a round 7 grow game seems very hard to beat).
Not played with it at all yet:
Pulverizer plow, Forest clearer, Acquirer
Everything else seems strong (and in some cases very strong) but not clearly bannable to me yet. I'm lot more willing to lose to a card that has too many small incremental benefits than something which does a massive blowout of the game though.
Edit: Bed maker seems like another card that is possibly going to enable too easy growth, and goes in my "probably getting banned eventually" category, but i would also want to see it play out more.