From another thread...
I’m curious what you mean by Jumpstart being a way to create a cube. Are you suggesting taking 24 Jumpstart boosters, shuffling everything except the basic lands together, and using that as a cube, trusting WotC to have included enough cross synergies to make it work? Or do you plan to create a ‘cube’ of your own Jumpstart boosters for quick play?
My idea was Make Your Own Jumpstart Cube
The cube owner simply creates jumpstart sets just like Wizards has done with their themes. Some examples could be a mono black Innistrad theme which are 20 cards where 12 of them are mono black spells and 8 are lands. One could make a mono green Zendikar theme which are 20 cards where 12 of them are mono green spells and 8 lands. Etc. for each set/block/plane of Mtg.
Or one could make Jumpstart sets from other themes. Like "Artifact matters" theme. Or a "Lifegain matters" theme.
The way I would probably do it would be to have 50 % of the sets be called something like Divine, Angelic, Monstrous, Thieving, Cunning, Artificial, Enchanting.. and the other 50 % of the sets be called something like Pirates, Goblins, Saboteurs, Walls, Ninjas, Advisors, Demons, Aristocrats, Plants.. In this way you would get one set from the first catagory and one from the latter and often end up with wacky combinations like Thieving Walls.
You would play the the same way Wizards suggested with each player randomly gets two themes and shuffle them together.
The downside compared to normal cube is first and foremost that the players have less control over their own destiny. The upside is time and variance. I imagine one could have the first game started in less than 5 minutes. Power level is, just like cube, up to the owner.