I didn't bother making a post for strixhaven since it was fairly lackluster for my cube in general (only change was Baleful Mastery), however where Strix had 1 addition, MH2 has many, so very many.
Ragavan is a slam dunk for cube, in fact it may be too good, and is probably now the best 1 drop in red (if not the cube). Four of the evoke emotions from MH2 were also slam dunks and support a wide variety of archetypes. Damn was also an easy addition, but was hard to classify as a card. Dauthi Voidwalker is one hell of a card, and easily rounded out the black 2's. Ignoble Hierarch was another easy addition, and makes for a critical mass of 1-drop dorks that I was looking for. The new sword is pretty darn good, not perfect, but it brings the cube to the required density for stoneforge (finally). Lastly, Grist is just plain bonkers in BG.
The drops were a bit hard this go around, as things are getting tighter. and are subject to change.