I'm attempting to have a mostly fair-stuff cube.

I've modeled it after a few I've found on this website, notably Bun Magic and a few of the more graveyard- and synergy-dependent low-curve cubes.

My goals were as follows:
No 2-card combos.
No cheat effects.
No Oops-All-planeswalkers-and-wraths in a 5-color shell type-decks.
Lots of 2-drops and 3-drops to help make it so you can go aggro or slow down the opposing aggro decks no matter which colors you choose.
Some amount of synergy (low floor // high ceiling) pieces to keep the games from being just about which player got the best curve/start. But the curve of each player's deck absolutely matters.

Then of course I've edited it more than I've tested it, so there's always more I will learn once I see these decks/cards in action a few times and get good constructive feedback about this particular version.