Quite often I get friends, coworkers and acquaintances who show interest in trying magic but who don't want to spend any money to do so. I thought rather than teaching them to draft from packs or try to put together decks for them to use I might combine the two ideas and create a cube I can use to help teach new players the principles of deck building and of course a lot of the key rules.
That said, this will be very much like a core set in that it will feature a lot of simple creatures and keyworded abilities, rather than tons of super rare cards with walls of confusing rules.
Like any cube I want it to obviously be balanced between the colours but also emphasize what each colour is traditionally known for doing well. I also want to have some support for multi-coloured decks and introduce ideas like tribal decks.