The sideboard is 45 cards for a 9th player.  I own all of the cards and any of them could be added to the 8 player, 360 card cube.

The cube is currently 361 cards due to the fact that I have 5 swords and Jitte.  The intent is to cut one at random each draft, but I could also cut something else.

Cards that I want to cut now:

Green Sun's Zenith - Birthing Pod and Survival offer tutor effects for green and I want to get rid of one.

Regrowth -  Eternal Witness does it better and is tutorable with Pod or Survival.

Sword of Fire and Ice, Sword of Light and Shadow, Sword of Feast and Famine - Swords create a drafting problem in that they are always picked first or second no matter where they are and put people into similar decks.  Reducing to two swords will help alleviate this.

Cards that I own that are worthy of consideration:

Dreg Mangler or Reaper of the Wilds - A lot of black green cards destroy permanents and another creature might be useful.  Does G/B want a hasty 3/3 or a difficult to deal with 4/5?

Maelstrom Pulse - To go with the above G/B creatures, Pulse is currently out in favor of Abrupt Decay and Vraska.  Current G/B line up is Vraska, Abrupt Decay, and Pernicious Deed.  What are the best three of the six for G/B?

Mystical Tutor - Good in control, and any sort of combo that exists.  What to cut?

Blood Scrivener - Good in some sort of black/x aggro where you get hellbent as soon as possible, but otherwise blah.

Strip Mine - Can make games really unfun for one player.  No infinite recursion with Crucible of Worlds in my cube, but can be infinitely recurred with Sun Titan.  Can randomly hose a player who kept a three land hand and never draws another.

Enclave Cryptologist or Looter il-Kor - Want to replace Civilized Scholar.  Which of these is better in my cube?  Cryptologist requires investment and is better in control or combo.  Looter can be in any deck, but is probably best in a blue tempo deck.  Looter can't block, making it somewhat worse than Cryptologist in control.

Heartbeat of Spring - Good in combo and ramp.  Symmetrical effect, and opponents gets advantage of it first.  What to cut?

Tempt with Vengeance - Works well with a lot of cards.  So does Goblin Rally.  Tempt has hasty elementals.  Rally has non-hasty goblins, but works well with Krenko and Siege-Gang Commander.

Black - Duress, Tragic Slip, Ultimate Price, Gatekeeper of Malakir, Withered Wretch, Stab Wound, Agent of Fates, Murder, Disciple of Bolas, Snuff Out, Unburial Rites

Cards I don't own that I would include:

Lilliana of the Veil - Replace Lilliana Vess.  Much better in my cube with discard for reanimation.  The sacrifice effect will always be good, as will the ultimate.

Deathrite Shaman - Replace Life/Death.  More graveyard hate, good with fetches.  Good utility in phases of game.

Scavenging Ooze -  Replace Wild Mongrel.  2/2 for 2 that is way better.  Mongrel is too narrow to excel.

Far // Away - Replace Dimir Guildmage or Infatham Infiltrator.  Blue/black cards have too many creatures.  Cube needs more bounce, and the sacrifice is always fine.  Could maybe cut Innocent Blood and add something else since this could be too much sacrifice.

Cryptic Command - Replace Dismiss.  Obvious is obvious.

Thalia - Replace Steppe Lynx. A card white aggro wants to hinder the ability of other decks to stabilize.

Baleful Strix - Replace Shadowmage Infiltrator.  It's an artifact, draws a card, and kills a dude.  Perfect control card and great synergy with my cube.