The goal of this cube is to provide the interesting deckbuilding decisions and synergistic gameplay of cubes like Caleb Gannon's Powered Synergy Cube, but at a lower power level and a much cheaper budget.
The following is a broad list of archetypes for each colour - there are many different ways to build each colour combination and fun build-arounds to go for, but hopefully this provides a decent starting point.
White: ETB effects & Tokens
Blue: Tap abilities & Self-mill
Black: Sacrifice & Discard
Red: Aggro & Direct damage
Green: Ramp & Elves
Azorius: Value ETBs
Izzet: Artifact aggro/combo
Rakdos: Aggressive sacrifice
Golgari: Lifegain ramp
Selesnya: Go-wide tokens
Orzhov: Token Sacrifice
Dimir: Self-discard value
Simic: Tap/untap abilities combo
Gruul: Aggro landfall
Boros: Aggressive ETBs