Just a few additions. I've been thinking more about the structure of aggressive decks and supporting two color aggro decks which emphasize one color to mitigate inevitable mana issues. In that light it makes sense that blue and especially black can still play a role in aggro decks even if they don't serve as the base color. With that in mind I'm feeling more willing to include a few support cards in these colors.

Judith, the Scourge Diva, Lampad of Death's Vigil, and the recently added Cruel Celebrant seem like perfect fits in that light. They can be powerful cards giving reach to aggressive decks, even if they're not played on curve, while still having a spot in slower decks trying to grind out value. Giving more support to 'go wide', token, and sacrifice strategies opens up more strategies. The interplay between going tall vs wide and different types of removal this adds creates a strategic axis I think is interesting. The biggest risk I see with these is just that they might present misleading signals.

Phyrexian Tower just floated past my radar and caught my attention. Free sacrifice outlets that don't take a 'spell slot' seem like a boon. I think it could end up being a fun build around with an interesting level of risk. The risk is it's just extremely swingy and creates a lot of feel bads. I'm curious to find out.

Werebear is another one that's just been on the fringes for a while. Signaling 'threshold' could be a downside, but I like the card. I might end up dialing back a green dork or two. I'm getting much happier with where the green section is, but I want to push aggressive / midrange a bit more. Werebear feels more in line with that then say Leafkin Druid which is looking suspect.