I am going to start this thread because these two archetypes are the ones I'd like to see pushed most with new printings. My reasons for each are very different though.
I love this archetype and innovate around it a lot so that is my #1 reason for wanting to see it pushed with new printings.
I think it is on the cusp of being tier 1 and 1 more solid printing would probably put it over the top and make it solidly tier 1.
Humans now fills the role of "keeping broken decks honest" that Lodestone shops used to do. Shops still does this to an extent, but it has been weakened a lot in that role from recent restrictions and has had to turn to become a more inconsistent and aggro-based deck. This would be fine if there was another deck that attacked from a totally different angle that also filled that role. My hope is that Humans can be that deck.
This archetype has been given almost no love with new printings and it still suffers a great deal to even 1 sphere effect on the table.
The possible printings could get very creative and R & D could really think outside the box to push this archetype.
Combo has a way of keeping fairer decks in check while also racing unfair decks like Mentor and both those things seem good for a healthy format.
Combo is a challenge to pilot so it wouldn't just dominate because most players screw up while playing it like every other turn.
I'll get the ball rolling with one for each category. I also want to make it clear that I am open to refining these cards based on feedback in the thread. I'm just coming up with first drafts at the moment:
Arbiter of Silence
Creature - Human Cleric
Activated abilities of artifacts can't be activated.
Spells you cast cost X less to cast where X = the storm count -1.