The Legions of Power is a PCG TCG created by Magic Paper Productions in 2022. Set 1, called Icons is set to release on the MPP Marathon Week. The game was originally named "The Collection", but MPP decided it sounded more PCG-like if it was given a canonical PCG team name. (The name originates with the unfinished PCG "Legions of Power" by Chris; it's unclear if the TCG has any connection to that game beyond the name or not).
Canonically, this game doesn't exist in the main PCG timeline, rather, something else, but no more information has been disclosed as of now.