Neutral.
Event. Cost: 1.

Reaction: After you win a challenge by 5 or more STR, search your deck for a location with printed cost 3 or lower, and put it into play. Shuffle your deck. (Max 1 per challenge.)

Glen Osterberger
Taking the Black #17.

Link: Decklists

Support of the People
Reviews

Rules FAQ

A card does NOT need to be in play/active at the timing it's triggering condition happened, merely in play/active in the window for its interrupt/reaction to be used. Therefore, you CAN win a power challenge by 5, trigger Support of the People to put The Mander into play, and then trigger the Mander. Same goes for an unopposed challenge and Great Kraken, etc.