JUPITER, Fla. — The most captivating thing about Jason Heyward may also be the most confounding. He could be any type of player you imagine, and it is almost time to put a price on his future.

Heyward, the new right fielder for the St. Louis Cardinals, is 25 years old and will be eligible for free agency after this season. He has shown an unusually wide range of skills in his five-year career. Dream of his future, and anything seems possible.

“He’s been a premier defensive player from Day 1,” said John Mozeliak, the Cardinals’ general manager. “But when you talk about your offensive profile, he went from a power hitter to a leadoff hitter to focusing on getting on base. I think the $100 million question is, Which is he?”

The Cardinals are eager to find out. In November they traded two pitchers, Shelby Miller and the prospect Tyrell Jenkins, to the Atlanta Braves for Heyward and reliever Jordan Walden, the most significant move for a team that has reached the last four National League Championship Series.