What is the name of movie in which Vincent Price plays a warlock with Boris Karloff?

There isn't a movie where Vincent Price plays a warlock with Boris Karloff. While both actors starred in numerous horror films, they never appeared in a movie together where Price played a warlock.

It's possible you're thinking of a different film, or perhaps you're mixing up the details of some of their roles. Can you tell me more about the movie you're thinking of? Maybe you remember the plot or another actor who was in it.