I will say, as much as I'm not super a fan of Upheaval / Armageddon, these cards have led to some super interesting games over the years. When you cast one of these big spells and the game doesn't end immediately, things can get juicy.
I was cleaning out my Google Drive and found something from 2015 that I called 'Chess Drafting'. I have no recollection of ever doing this, but it looks pretty dope.
Statistically, the variance of drafting a subsection of a cube (e.g. 360 out of 450 cards) is going to cause much greater differences in card counts per color per draft than having the numbers per section slightly different.