The Backbone of the Cube was designed to mimic what could happen in a real Conspiracy draft. Though it doesn't follow the exact pack construction you would find cracking packs, it is similar.
600 Cards total in Cube.
The 4/2/1/1 distribution allows each card to appear enough times per draft as you would expect in normal pacts. This cube has 615 cards. 600 cards plus 15 for one extra pack due to Lore Seeker so that breaks down like so:
This cube has a few extra cards to flesh out to cube to help get to the 600 card total. These extra cards were added to help support multicolor play. And 15 cards to flesh out enough cards for an extra pack.
Extra 60 + 15 for extra PackMirrodin's Core x 8 instead of 2
Paliano, the High City x 2 instead of 1
Reflecting Pool x 2 instead of 1
Runed Servitor x 4 instead of 2
Brago's Favor x 5 instead of 4
Immediate Action x 5 instead of 4
Muzzio's Preparations x 5 instead of 4
Secrets of Paradise x 5 instead of 4
Sentinel Dispatch x 5 instead of 4
Basandra, Battle Seraph x 2 instead of 1
Flamewright x 4 instead of 2
Dack's Duplicate x 2 instead of 1
Marchesa's Smuggler x 4 instead of 2
Edric, Spymaster of Trest x 2 instead of 1
Wood Sage x 4 instead of 2
Spirit Monger x 2 instead of 1
Deathreap Ritual x 4 instead of 2
Magister of Worth x 2 instead of 1
Mortify x 4 instead of 2
Woodvine Elemental x 4 instead of 2
Selvala, Explorer Returned x 4 instead of 2
Decimate x 2 instead of 1
Fires of Yavimaya x 4 instead of 2
Spontaneous Combustion x 4 instead of 2
Grenzo, Dungeon Warden x 2 instead of 1
Extract From Darkness x 4 instead of 2
Dimir Doppelganger x 4 instead of 2
Brago, King Eternal x 2 instead of 1
Sky Spirit x 4 instead of 2
Gnarlid Pack x 5 instead of 4
Selvala's Enforcer x 5 instead of 4
Scaled Wurm x 5 instead of 4
Nature's Claim x 5 instead of 4
Selvala's Charge x 5 instead of 4
Skitter of Lizards x 5 instead of 4
Lizard Warrior x 5 instead of 4
Treasonous Orge x 5 instead of 4
Pitchburn Devils x 5 instead of 4
Brimestone Volley x 5 instead of 4
Victimize x 5 instead of 4
Tragic Slip x 5 instead of 4
Zombie Goliath x 5 instead of 4
Grudge Keeper x 5 instead of 4
Quag Vampires x 5 instead of 4
Plated Seastrider x 5 instead of 4
Enclave Elite x 5 instead of 4
Marchesa's Emissary x 5 instead of 4
Brainstorm x 5 instead of 4
Split Decision x 5 instead of 4
Rousing of Souls x 5 instead of 4
Swords to Plowshares x 5 instead of 4
Pillarfield Ox x 5 instead of 4
Brago's Representative x 5 instead of 4
Apex Hawks x 5 instead of 4
So you can draft the normal 3 packs per player and have a significant amount of chaff left in the "shoe" as to ensure each draft isn't the same each time you play the cube. Or you can power up your draft by drafting by adding additional packs (go to 4 or even 5) increasing the likelihood of more uncommons and rares/mythics make it into your deck, but remember you will also increase the likelihood of some of the very powerful commons in significant numbers are there too. And increases the time drafting takes, however since draft matters the game is already afoot.
Seeding Boosters PacksJust randomize the whole cube and build the packs. There is no special seeding required.
Suggested minimum of 4 players to draft. Supports up to 8 players max.