The idea behind this cube is to allow the archetypes to shine by removing chaff that created a lack of focused synergy while drafting. Currently the set is based on data from 17lands, however as I play it with friends and hear feedback from others, there may be further changes to help with balance or create greater synergy for a specific archetype. There have also been a few extra cards from other sets added, though these additions are minimal and as of now are for added Vehicles and a Warrior card.
To make a pack for this cube, you will pick 10 commons, 3 uncommons, 1 rare or mythic rare, and 1 land. It is very important to have four separate piles in this cube. A pile for every common, every uncommon, every rare and mythic, and a pile of the dual lands mixed with unused cards in a ratio of 1:2. These cards can be basic lands, tokens, bulk cards with their backs facing out, it doesn't matter. As long as there is a 1 in 3 chance that a dual land will be picked and drafted, and a 2 in 3 chance that it is an unusable card that wastes a slot. The cube currently has 30 dual lands, which means there must be a total of 90 cards in this last pile.