Leopold, who spent three seasons with the Flames, had 6 goals and 14 assists in 64 games with the Avalanche this season.
Nycholat, 29, was claimed off waivers by Calgary from Vancouver on Tuesday. He played 14 games for the Canucks this season, had 1 assist and was plus-3.
Introducing the new official NHL App, available for iPhone, iPad and Android smartphones and tablets. A host of new features and improved functionality are available across all platforms, including a redesigned league-wide scoreboard, expanded news coverage, searchable video highlights, individual team experiences* and more. The new NHL App on your tablet also introduces new offerings such as 60fps video, Multitasking** and Picture-in-Picture.
*Available only for smartphones
** Available only for suported iPads