This cube is based around the playtesting cards from the mystery booster boxes paired with some of the more interesting and powerful silver border cards that don't disrupt gameplay too much.

Archetypes:

WU --- Fliers
WB --- Aristocrats
WR --- Spell Aggro
WG --- Tokens
UB --- Card Theft
UR --- Storm//Magecraft
UG --- Copying
BR --- Magecraft Control
BG --- Counters and Tokens
RG --- Creature Aggro

List:
400 Card Cube
(250) 50 of each mono color
60 multicolored
40 artifacts
50 lands