Sadducees will become a major player in Acts. Check out this article if you wish.

Compared to the Pharisees, they were more closely connected to the rulers of the kingdom, may have been even wealthier/more powerful, denied resurrection and were one of the ruling parties.

So, a Sadducee asking about resurrection is ironic at the least, plotting at worst. Jesus pushes them and answers using Moses as the best argument. They can’t fight back. Notice what happens: Jesus knows their argument and their belief so well He is able to craft a defense and response that gives them little to argue with. We have a long way to go here!