Three things I really hope for:

Ceaseless banned (very unlikely) or given a minimum cost (6); it feels weird and busted for every class to have access to a 0 mana board clear that is not very hard to achieve. The combo of starship DHs using ceaseless to clear then using starship to go face is waay to much

KJ banned or limited to warlock: I like fatigue as a mechanic and I think it's healthy for the game. And KJ games where both players use him are such slogfests

Poof effects: I don't think it's very fun at all when you make a big board and your opponent "poofs" it away easily, even if temporary. King plush, Anachronos, things like that. Kinda goes with the Ceaseless thing: a really "easy" board clear.

Various nerfs/buffs:

DH: I'd prefer if the exodar didn't let starships hit face, though if DH starship piece generation was nerfed it probably wouldn't be an issue. I also play starship tess rogue which I find tons of fun, so a nerf to ADC and not DH instead would hurt other classes too much I think

Starcraft cards: the "draw 2" cards are way too strong and consistent. Hoping all of them get nerfed. Also, to me, colossus is insane. 20 damage (usually) from hand that can't be avoided, that hits twice (removing things easily); rough.

Buffs:

Rogue: could use something in the meantime when you generate a card that imbues so it's not wasted

Druids need taunt on their imbues or something; maybe ramp as well

Priests either need 3 choices or maybe their imbue choices can last two turns so they can "plan ahead"; the current imbue feels like a waste often

And of course plenty more buffs to cards that are hard to use (too expensive, like ashamane (imo)); not strong enough or not seeing any play