red: aggro
white: balanced
green: midrange
blue: control
black: combo

red/white - aggro/balanced - weenie
red/green - aggro/midrange - big trample
red/blue - aggro/control - "spells matter"
red/black - aggro/combo - madness
white/green - balanced/midrange - "enchantments matter"
white/blue - balanced/control - flicker
white/black - balanced/combo - lifegain
green/black - midrange/combo - reanimator
green/blue - midrange/control - clones, polymorph
blue/black - control/combo - mill