this is my original list, mainly inspired by "The Pauper Cube" and the "Pauper MenguCube"

every card is currently Pauper legal
I'm being a purist about this and in my book "Pauper" means "Pauper legal"
obviously this is Cube and you can do whatever you want, though :)

Cube IS a singleton format
again, my approach as a purist stipulates that there's only room for the best version of a card and there is no room for functual reprints. so, since there is Lightning Bolt, there is no need for Shock and after the printing of Planar Disruption there was neither need, nor space for good old Pacifism anymore. Given Reckless Impulse and Wrenn's Resolve do the very same thing, only Impulse is in the Cube.

neither Monarch nor Initiative cards are in the Cube
the goal is to keep the complexity level manageable (especially for beginners or people returning to M:tG)
also, these cards are so potent that they can warp a game completely, making it all about getting the Monarchy or Initiative (back), thus leading to potentially frustrating non-games

there are no clear cut (and especially supported) archetypes
again, the objective is to have the draft and play environment not be too complex but also the fact that usually only 270 or 360 of the 540 cards are being opened means that some key cards might not be opened this draft and recovering from that mid or late in the draft is fairly tricky in an all Commmons format
instead the Cube feels more like a deeper core set draft environment, with all your classic, colour typical characteristics

aggro, go wide (tokens), flyers, support colour for control
control, tempo, flyers
control, midrange, sacc, graveyard synergies
aggro, tokens, burn
ramp, fatties, tokens, multicolour enabler

this Cube's version of "Power Nine" and desirable first picks: