That is a tie between Colby Donaldson in Season 2, The Australian Outback and Terry Deitz in Season 12, Panama. They both had 5 immunity wins in a row and are in the elite group of having had the most immunity wins. This group exists out of 5 men : Colby Donaldson, Season 2 Tom Westman, Season 10 Terry Deitz, Season 12 Ozzy Lusth, Season 13 Mike Holloway, Season 30.
Colby and Terry were the only ones who had all 5 of them in a row, the others all had a challenge in there which they didn't win. From those 5, only 2 people won their season. Namely Tom Westman and Mike Holloway.