Here I have analyzed 152 vintage cube drafts and laid out my win rate with each color pairing. The win rate is represented by the minimum and maximum expected values, which provides a range since the number of samples for many of these is not too good. This post is part of a complete analysis, you can find my win rate for every card here, as well as winning and losing card pairings by clicking the respective links. (There is more below the table).

Colors	Minimum Expected Win Rate	Maximum Expected Win Rate	Matches Played
Green	100%	100%	6
Blue	67%	83%	12
Green, Blue	49%	66%	33
Black	100%	100%	3
Blue, Black	78%	83%	36
Green, Blue, Black	46%	60%	15
White	75%	80%	9
Blue, White	73%	80%	51
Green, Blue, White	64%	76%	27
Black, White	67%	80%	15
Green, Black, White	67%	67%	9
Blue, Black, White	61%	72%	12
Red	81%	86%	6
Green, Red	42%	47%	9
Blue, Red	66%	78%	57
Green, Blue, Red	50%	75%	24
Black, Red	51%	66%	12
Green, Black, Red	46%	65%	9
Blue, Black, Red	56%	71%	30
Green, Blue, Black, Red	42%	58%	12
White, Red	56%	78%	18
Green, White, Red	100%	100%	3
Blue, White, Red	61%	72%	24
Green, Blue, White, Red	58%	76%	15
Black, White, Red	81%	86%	6
Blue, Black, White, Red	0%	0%	3
Green, Blue, Black, White, Red	0%	0%	3

One thing to notice here is that playing more colors is pretty heavily correlated with a decrease in win rate. In fact we can plot the mean win rate as a function of number of colors, which I have done below.