Army. Mercenary.
Bestow (1). Pillage.
Brave Companions get +1 STR for each character you control with 1 or more gold.
Reaction: After you marshal Brave Companions, search the top 10 cards of your deck for an Army character, a Commander character, and a Mercenary character, reveal them, and add them to your hand. Shuffle your deck.
Link: Decklists
Rules FAQ
You do not need to find all three characters, even if three are available.
You are allowed to find up to three different characters even if one of those characters has more than one of the searched-for traits. You can also find two copies of the same character (for instance, Vargo Hoat), one for each trait.