ARCHETYPE BREAKDOWN: Each two-color pair in the cube is built around a deck archetype listed below:

Azorious(WU): Flicker

Dimir(UB): Ninjas

Rakdos(BR): Sacrifice

Gruul(RG): Lands Matter

Selesnya(GW): Enchantments matter

Orzhov(WB): Lifegain/drain

Golgari(BG): Graveyard matters

Simic(GU): +1/+1 Counters

Izzet(UR): Spells matter

Boros(RW): Tokens

Think of these color pairs as guidelines, not restrictions. There are, for example, many black, green, and blue cards that would fit well in a tokens deck, and it's entirely possible to build a red-white deck that does not focus on tokens. This is true for all 10 color pairs so do not feel like those 10 archetypes are your only options. There are also 5 less represented mono-color archetypes:

Mono White: Prison

Mono Blue: Artifacts Matter

Mono Black: Vampire Tribal

Mono Red: Goblins Tribal

Mono Green: Ramp

These decks are more difficult to put together, but could provide additional synergy to a multicolor deck, or, if you're lucky, come together into a focused mono-color deck. Thanks for checking out my cube!