25 cards where the set is “soi” and the text includes “investigate”

Briarbridge Patrol (Shadows over Innistrad #195)
Bygone Bishop (Shadows over Innistrad #8)
Byway Courier (Shadows over Innistrad #196)
Confirm Suspicions (Shadows over Innistrad #53)
Confront the Unknown (Shadows over Innistrad #198)
Daring Sleuth // Bearer of Overwhelming Truths (Shadows over Innistrad #54)
Daring Sleuth // Bearer of Overwhelming Truths (Shadows over Innistrad #54)
Declaration in Stone (Shadows over Innistrad #12)
Drownyard Explorers (Shadows over Innistrad #56)
Erdwal Illuminator (Shadows over Innistrad #60)
Expose Evil (Shadows over Innistrad #19)
Fleeting Memories (Shadows over Innistrad #62)
Gone Missing (Shadows over Innistrad #67)
Humble the Brute (Shadows over Innistrad #23)
Jace's Scrutiny (Shadows over Innistrad #70)
Magnifying Glass (Shadows over Innistrad #258)
Ongoing Investigation (Shadows over Innistrad #77)
Press for Answers (Shadows over Innistrad #80)
Root Out (Shadows over Innistrad #224)
Survive the Night (Shadows over Innistrad #41)
Tamiyo's Journal (Shadows over Innistrad #265)
Thraben Inspector (Shadows over Innistrad #44)
Tireless Tracker (Shadows over Innistrad #233)
Trail of Evidence (Shadows over Innistrad #93)
Ulvenwald Mysteries (Shadows over Innistrad #236)
Weirding Wood (Shadows over Innistrad #240)

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