by delirimouse
The allied colors, as seen on the back of every Magic card ever made, are WU, UB, BR, RG, and GW. That makes the enemy pairs WB, BG, GU, UR, and RW. This is something they have played down a lot lately because draft is more interesting if you can choose from 10 color pairs instead of 5.The guilds in Return to Ravnica and Gatecrash are broken up without regard to allied and enemy color pairs. Many recent blocks have played up different color relationships than the standard (though the tribes in Innistrad went straight around the wheel).