Synergy based peasant cube. Archetypes include:

U/W Flyers
W/G +1/+1 counters
W/B Lifegain
W/R Aggro
B/G Graveyard
B/U Reanimator
B/R Sacrifice
U/R Spells Matter
R/G Ramp/Midrange
U/G Ramp/Flash

Also supported are:

U/W Flicker
U/X Control
W/X Tokens