This cube showcases multi-colored cards that might otherwise get cut. It's played with the house rule that everyone can add up to 3 of every type of guildgate when adding lands to their deck after drafting.
The themes are:
Azorius Control
Boros Equipment
Dimir Theft
Golgari Reanimate
Gruul Lands
Izzet Spells
Orzhov Aristocrats
Rakdos Sacrifice
Selesnya Tokens
Simic Ramp