Rival of the Dodgers and Rockies, informally

DBACKS

Think of the snake-themed team that plays its home games in Arizona’s desert heat.

This clue refers to the Arizona Diamondbacks, a Major League Baseball team often called "D-backs" informally. They’re rivals with the Los Angeles Dodgers and Colorado Rockies in the NL West division. The answer "DBACKS" is a shortened, casual version of the team’s nickname.