Art by Jack WangAll-colorless cube, designed primarily for 2p Winston Drafts. Colored mana is only available via non-basic lands or other drafted sources, and will almost always cost you life, an extra land (via filtering), a creature, or some other price. Not that there are a ton of colored costs, but it's something to keep in mind.
Here are some of the major subthemes that can be assembled:
+1/+1 Counters
Build 'em up, pass 'em around.
Attack of the Myr
Go get 'em, little guys!
Sacrifice
Mmmm... crunchy.
Token Swarm
Spawns, Scions, Myr, Gnomes, Soldiers... beat your opponent through sheer numbers.
Ramp
With this many Eldrazi and other giant constructs running around, you're gonna need more than just lands.
Lands
Speaking of Lands, many of them aren't sitting by idly either!
Equipment/Vehicles
Not really a synergy-driven strategy, but there are definitely ways to make your smaller creatures more threatening.
After sleeping on it, the answer became obvious. If you need to do anything Magic-related in multiples of five, there's only one option: one of each color.
270! Now each Winston sees 1/3 of the pool, which should offer up approximately 20 lands in each pile.
Also, selfishly, now I only need 300 sleeves. I won't claim that was the primary force driving the slim-down, but it was definitely a factor.
