35 cards where the text includes “powerstone” and the set is “bro”

A-Excavation Explosion (The Brothers' War #A-132)
A-Geology Enthusiast (The Brothers' War #A-289)
A-Hall of Tagsin (The Brothers' War #A-263)
Arbalest Engineers (The Brothers' War #206)
Argothian Opportunist (The Brothers' War #167)
Ashnod, Flesh Mechanist (The Brothers' War #84)
A-Splitting the Powerstone (The Brothers' War #A-63)
A-Thran Spider (The Brothers' War #A-254)
A-Urza, Powerstone Prodigy (The Brothers' War #A-69)
A-Urza's Command (The Brothers' War #A-70)
A-Visions of Phyrexia (The Brothers' War #A-156)
Cityscape Leveler (The Brothers' War #233)
Excavation Explosion (The Brothers' War #132)
Fallaji Excavation (The Brothers' War #178)
Geology Enthusiast (The Brothers' War #289)
Gix's Caress (The Brothers' War #96)
Great Desert Prospector (The Brothers' War #7)
Hall of Tagsin (The Brothers' War #263)
Horned Stoneseeker (The Brothers' War #138)
Junkyard Genius (The Brothers' War #214)
Koilos Roc (The Brothers' War #55)
Mishra, Lost to Phyrexia (The Brothers' War #163b)
Powerstone Engineer (The Brothers' War #20)
Repair and Recharge (The Brothers' War #24)
Sarinth Greatwurm (The Brothers' War #220)
Sibling Rivalry (The Brothers' War #152)
Slagstone Refinery (The Brothers' War #243)
Splitting the Powerstone (The Brothers' War #63)
Static Net (The Brothers' War #27)
Stern Lesson (The Brothers' War #64)
Stone Retrieval Unit (The Brothers' War #248)
Thran Spider (The Brothers' War #254)
Urza, Powerstone Prodigy (The Brothers' War #69)
Urza's Command (The Brothers' War #70)
Visions of Phyrexia (The Brothers' War #156)

The arc of my blade has carved a path of light to the end of these results.