The Basics
The cube is here.
Here's what I'm thinking so far.
The Cube Itself
The cube will be 360 cards
50 cards of each color, about half creature and half noncreature, including monocolored lands
2 nonland cards of each color pair, a creature and a noncreature
30 color-fixing lands, split up into 6 groups of 5; e.g. allied colored shocklands, wedge colored taplands,
1 nonland card for each color triple.
5 utility lands
45 flex spots; mostly colorless cards, but might include cards with 4 or 5 colors, or cards with unusual use of color, like hybrid, monocolor with off-color activations, etc.
The Polls
Each poll will have a theme, e.g. MV 3 or less black kill spell, MV 3-4 white creature w/o flying, enemy-colored land cycle
Each poll will last 24 hours.