Cube-in-Progress.

Pivot Archetypes:
Cycling
Ramp

Two-Color Archetypes:

Fliers and Artifacts
Heroic/Enchants
Mill/Reanimate
Sac/Counters
Trample/4-Power
Draw/Discard
Drain/Reanimate
Sac/Burn
Tokens/Vigilance
Tempo/Cascade

Three-Color Archetypes: (These are only lightly supported and should only incentivize three-color decks if splashable.)

Swinging with Everything

Big Fight, Big Burn

Dodgy Fliers

Noncreature

Hand Econ/Espionage