Sac/Aristocrats (Main: B/W/R)
Blink (Main: U/W, Minor: G)
Spells/Prowess (Main: U/R, Minor: W)
Equipment (Main: W/R)
Creature Tokens (Main: W/G/R, Minor: B)
Graveyard Value (Main: G/B, Minor: U)
Life Gain (Main: B/W)
Tempo (Main: U/B, Minor: W)

Given that each color spans across multiple archetypes, playing >2 colors should be common and a high amount of fixing is available. Enjoy!