This is an OG Ravnica block 360 card cube comprising of Ravinca: City of Guilds, Dissension, and Guildpact.

I tried to fit an archetype for each of the ten guilds:
{W/B}Lifegain
{B/R}Hellbent/Discard
{R/U}Replicate
{U/G}Graft
{G/B}Dredge
{B/U}Mill/Transmute
{U/W}Flyers
{W/R}Aggro Enchantments
{R/G}Bloodthirst
{G/W}Tokens/Convoke

I have always had a lot of fun playing with the cards from the Ravnica block so I decided to create a best of the best from limited. Let me know your thoughts!