5 cards where the set is “bro” and the cards are Jumpstart cards

Rescue Retriever (The Brothers' War #288)
Geology Enthusiast (The Brothers' War #289)
Terror Ballista (The Brothers' War #290)
Artificer's Dragon (The Brothers' War #291)
Woodcaller Automaton (The Brothers' War #292)

This search is finished. Now the real work can begin.