(Previous version: Ravnica: Cube of the Guildpact)

Shaved down version of my 720 card cube. I had a rule that each color should have a central theme, with the guilds at the intersection of them.

Tokens
Instants / Control
Sacrifice
Attacking / Aggro
+1/+1 Counters.

The land base uses duplicate guild-gates. If that's a bit slow for you, allow each player to play one Gate untapped per game.