While you definitely don't need to follow an archetype to make a good deck in this cube, it's a good to know the color philosophies used in this cube. You should also know that combos exist within this cube. (Cat oven, Underworld Cookbook/Daredevil, Argothian Elder/Maze of Ith, Renata/Persist to name a few)
Archetypes:
W/U: Fliers/blink
W/B: Removal/tokens
W/R: Equipment
W/G: Tokens
U/B: Reanimator
U/R: Artifacts
U/G: Goodstuff/Arboria lock
B/R: Aristocrats/Reanimator
B/G: Aristocrats
R/G: Werewolves
Any: Mutate (3-5 color)