The cards actually from MH2 here are:
Esper Sentinel
Solitude
Sanctum Weaver
Sythis, Harvest's Hand
Sword of Hearth and Home
Brainstone
Yavimaya, Cradle of Growth

Boreas Charger is worse than it first looked.
I've been wanting to remove Lyra for awhile. Testing will show if replacing a 5/5 flier with a 3/2 kill spell pushes toward too much removal.
Another curator put me onto Silverwing Squadron and it has tested very well. I've been wanting to remove Archon of Coronation because of its damage prevention effect, despite it being white card advantage and a decent blink target. I think the upside for tokens outweighs the downside for other decks.
Akroma's Will has gotten high numbers on EDHRec so I'll test it.
Forsake the Worldly is a fine card but basically a placeholder.
I've gotten tired of Gilded Drake - it's very powerful but not fun to play against.
Teferi is similarly unfun to play against, and doesn't particularly synergize with any archetype. Jace TMS synergizes with a few.
One of my regulars loves As Foretold and Fall from Favor has low numbers on EDHRec and I'm not happy with it either.
Goblin Rabblemaster always seems bad. Loyal Apprentice goes in more decks and has higher numbers on EDHRec and is cheaper.
Curse of Opulence has proven unfun to play against and I want more haste enablers.
I've been counting Fiery Confluence as a wrath since it's used as one most of the time, and Chandra's Ignition is better in that role.
Garruk Wildspeaker is a great card but I only have so many ramp slots and The Great Henge has earned its title and inclusion.
Return of the Wildspeaker has similarly earned an inclusion.
Nahiri is fine but I think there's enough card advantage in Boros now that I can cut it. Gisela is a must-remove card so I'm putting her back in.
I talked about Mindslaver on reddit, tl/dr I'd rather play Emrakul for the same role and decks.
Decided to include Ugin after listening to the Command Zone's podcast about planeswalkers.
Field of the Dead encourages drafting a 5c lands deck, and could just be a defensive card - neither of which I particularly want. But it has high numbers on EDHRec and a drafter suggested it, so I'm willing to test it.

On a side note, with these changes Green is no longer far and away the lowest average CMC out of any color. That should bring its power as a color more in line with the others.
The average CMC of my cube has just gone up from 3.46 to 3.51, so I'll be looking to trim it down in the future.