Are you sure you understand the differences between the Sadducees and Pharisees including but not limited to which of the two groups got along with the Herodians? And which group did not?
The emphasis for the OP is that the tempter of Christ was a man, a ruler well versed in the Old Testament. The exact religious affiliation of that ruler is a matter I am open to investigate further. The ruler had to be either a sadducee or a pharisee.