The analogy "Team:practice::cast:?" suggests that we are looking for a word that relates to "cast" in a similar way that "practice" relates to "team."
In the context of a team, "practice" is an essential activity that the team engages in to improve their performance.
For the word "cast," which often refers to the group of actors in a play or film, we might look for a similar activity that a cast engages in. The answer could be "rehearsal," as it is a fundamental activity that a cast participates in to prepare for their performance, just as a team practices to prepare for a game.
So, the complete analogy would be:
Team:practice::cast:rehearsal.