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

Azorious(WU): Flicker - play creatures with powerful "enter the battlefield" abilities and then recur those abilities by exiling your creatures and returning them to play

Dimir(UB): Ninjas - attack with unblockable creatures and use "ninjutsu", an ability that lets you swap out an unblocked attacker with a creature in your hand - usually a far more powerful creature

Rakdos(BR): Sacrifice - combine sacrifice outlets with abilities that trigger when a creature dies to double up your value! Play lots of cheap creatures or creatures that can come back from the dead to keep the value going

Gruul(RG): Lands Matter - enable landfall abilities by playing ramp spells and then curve out by playing big scary creatures faster than your opponents ever could. Plus, with all those lands, you can sacrifice a few for some quick value

Selesnya(GW): Enchantments matter - play cards that give you value for playing enchantments, and then play enchantments!

Orzhov(WB): Lifegain/drain - play creatures whose abilities trigger when you gain life, then steal life away from your opponent. Plus, with all that life you'll be gaining, you can spend a few life points for some quick value

Golgari(BG): Graveyard matters - play spells that fill your grave with cards, and then play cards that card about having a full graveyard

Simic(GU): +1/+1 Counters - play creatures that care about having counters on them, and then put a bunch of counters on them!

Izzet(UR): Spells matter - pair lots of prowess triggers, and cards that say "when you cast an instant" with lots and lots of instants

Boros(RW): Tokens - make an army of tokens that will overwhelm your opponent, and then make that army more powerful by playing cards that buff the whole team

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. Thanks for checking out my cube!