Behold, perfection!
m<WWWUUUBBBRRRGGG{W/U}{W/U}{W/U}{W/B}{W/B}{W/B}{U/B}{U/B}{U/B}{R/W}{R/W}{R/W}{B/G}{B/G}{B/G}{G/W}{G/W}{G/W}{R/G}{R/G}{R/G}{U/R}{U/R}{U/R}{B/R}{B/R}{B/R}{G/U}{G/U}{G/U} cmc=3 -is:split -is:mdfc
That should hit everything at cmc 3 with three pips, skipping over split cards...