W - Humans, Fliers, Spirits, Birds
U - Wizards, Fliers, Birds
B - Vampires, Zombies
R - Humans, Dragons
G - Elementals, Ramp

WU - Fliers, Spirits
WB - Aristocrats, Vampires
WR - Aggro, Equipment
WG - Go-wide, Tokens
UB - Zombies, GY matters
UR - Wizards, Instants/Sorceries, Elementals
UG - Elementals, Draw 2
BR - Aggro, Aristocrats
BG - Graveyard recursion
RG - Power 4 matters, Tall