Finn’s deck building says u to five other level O Seeker and/or Survivor cards. Is that 5 total yellow/red cards or 5 of each color for a total of 10 cards.

It is 5 total yellow/red cards.

I think it's phrased that way so that if Survivor or Seeker ever get any Illicit cards, that Finn can grab those and not count them towards the 5.