This is a cube I've been working on. It's nearing completion, at which point I'm going to proxy the cards for play. I'm still open to suggestions about what should be added and/or cut. Like I wanted to include a number of alternate win cons but the more I think about the Gates, the more I think I should cut those and Maze's End.
I also think there should be more creatures in there, so I'm especially open to suggestions on those, and especially in the colors that are lacking. I want to support cascade as well but the cube doesn't do that currently.
Um... what else... I figure any "balance" this cube might have comes from the card pool being so big that you have a relatively small chance of seeing any given card in a draft and therefore often won't get all the pieces you need to build an ideal deck. Like the Power Nine only make up 2% of the cube and at 18 cards (two copies of everything) it's quite possible you won't see any of them in an eight man draft (and most of the time I'd be drafting with fewer people anyway).
But yeah, hit me up with comments and suggestions please! Playing this is going to be quite the experience and I want to tweak it before I go to print.