A colour-shifted cube designed with unusual colour archetypes in mind.

Very loosely,
UG: Lifegain
BG: Artifacts matter
UB: Enchantments matter
UW: Big spells
WR: Creatureless control
WG: Sac/reanimator/persist
WB: Legendary matters
BR: Big creatures/power matters
RG: Madness/cycling/discard
UR: Tokens/go wide