I build this cube around a total of 10 archetypes, 5 mono color and 5 3 color.
Mono-White is tokens
Mono-Blue is +1/+1 Counters
Mono-Green is Lifegain
Mono-Black is Morbid/Dies effects
Mono-Red is Burn

Three Color Archetypes
Mardu-Burn (Headed by Oros, the Avenger)
Abzan-Life Gain and Drain (Headed by Siege Rhino)
Temur-Instants (Headed by Kalamax)
Jeskai-Aggro (Headed by Mantis Riders)
Sultai-+1/+1 and Tokens (Headed by Xavier Sal, Infested Captain)

There are also several others to be discovered.