Taking advantage of new cards to lower the curve, change things up, weaken the incarnations, and incidentally remove the last proxies. An improved scryfall search here.
Added Mirrex, bringing the UR card count back into line with other two-color pairs. Added in two more sources of LD, as Mirrex is markedly more problematic than any other lands in the cube.
Got in a couple more cards. I made swaps to prioritize creatures and variety of effects in the cube.