My dad started playing magic after us. To keep from needing to learn every card, he chose to just play mono white. Years later, he's comitted to the bit so much that while he is perfectly knowledgable about magic cards, he still only plays mono white (colourless cards get a pass) whenever possible. In every constructed format, forcing white in draft, and attempting it in sealed if he can.

So, here is a cube just for him. "Mono" white, where every card is technically mono-white or colourless, but with so much else going on you'd think it wasn't.

What counts as monowhite? Any card that can be played in some way with just white or colourless mana. So hybrid mana, or split cards with at least one white half. The idea is that a person doesn't need to run anything other than plains if they want to. As for off-colour cards like adventures, aftermath, flashback and the like; it only qualifies if the 'first half' is mono-white; while split cards only need either side to be mono coloured. 0-CMC cards with colour indicators, like Kobolds or the Pacts, also don't make the cut.

How about activated abilities? Ideally the cards should have a white colour identity if they have activated abilities with a non-white cost. So guildmages are fine, while spellbombs are not. Meanwhile, spells that care about non-white things, like Chained to the Rocks or Vedalken Gauntlets are fine - provided the person running them can meet their requirements; that's part of the fun!

Any silver bordered cards? Only Who // What // When // Where // Why. It excellently demonstrates the gimmick of the cube without actually introducing silver-bordered mechanics.

Why 384 cards? The cube has 16 card packs, with one card from a 'bonus sheet' put into each booster. This bonus sheet consists of 24 cards: the 8 dual lands, and 16 draft matters cards. Cube Cobra doesn't (as far as I'm aware) support this distribution, so it's just a 384 card cube here.

... and Stormbreath Dragon? Well, you see, he started playing in Theros, and Stormbreath Dragon was such a hassle for him. He took great fun in finding a monowhite way to deal with it, and his favourite was Ornithopter + Godsend. So, yeah, it's not exactly a monowhite cube, but everyone in the pod is going to get to have the same amount of fun trying to slay the dragon.