22 cards where the full Oracle text includes “learn”

Academic Dispute (Strixhaven: School of Mages #91)
Arcane Subtraction (Strixhaven: School of Mages #36)
Cram Session (Strixhaven: School of Mages #170)
Divide by Zero (Strixhaven: School of Mages #41)
Dream Strix (Strixhaven: School of Mages #42)
Enthusiastic Study (Strixhaven: School of Mages #99)
Eyetwitch (Strixhaven: School of Mages #70)
Field Trip (Strixhaven: School of Mages #131)
First Day of Class (Strixhaven: School of Mages #102)
Gnarled Professor (Strixhaven: School of Mages #133)
Guiding Voice (Strixhaven: School of Mages #19)
Hunt for Specimens (Strixhaven: School of Mages #73)
Igneous Inspiration (Strixhaven: School of Mages #107)
Overgrown Arch (Strixhaven: School of Mages #139)
Poet's Quill (Strixhaven: School of Mages #82)
Pop Quiz (Strixhaven: School of Mages #49)
Professor of Symbology (Strixhaven: School of Mages #24)
Retriever Phoenix (Strixhaven: School of Mages #113)
Rise of Extus (Strixhaven: School of Mages #226)
Sparring Regimen (Strixhaven: School of Mages #29)
Study Break (Strixhaven: School of Mages #34)
You Find the Villains' Lair (Adventures in the Forgotten Realms #84)

The message was clear to Sorin—time to search for something else.