Everything that wasn't good enough to make it into my 6 "real" cubes, but one day might finally make it. A playable on-deck binder.
Wildly unbalanced, mostly multi-colored, so I turned it into a multiplayer battle box [see mtgbattlebox.com for details], which gives you 3 of each basic (including Wastes) and one of each guildgate; all non-Waste basics are Snow lands. Also included draftable lands, if folks want to play it as a traditional cube.
This is also where certain themes live which I consider to be too much overhead for their drafting reward level. These include cards that require colorless to cast (i.e. Eldrazi), cards that care about the Snow subtype, and double-sided cards which require you to read each side and pick which side you are casting (e.g. Kaldheim Gods).