"cube" for constructed play

an idea I've toyed with before is instead of making a cube that is a set for drafting, it is just a list of cards that can be used to produce constructed decks (forgive me if this is not the first time someone has talked about this)

the thing is I'm not really sure what practical considerations for building a list that I would need to consider that are different from a draft format

what would be a good size for the card pool for instance?