39 cards where the lore includes “barrin”

Angelic Shield (Duel Decks: Venser vs. Koth #27)
Back to Basics (Ultimate Masters #46)
Barrin (Vanguard Series #201)
Barrin, Master Wizard (Urza's Saga #63)
Barrin's Codex (Urza's Saga #286)
Barrin's Spite (Invasion #235)
Barrin's Unmaking (Invasion #46)
Barrin, Tolarian Archmage (Core Set 2021 #45)
Bog Initiate (Invasion #95)
Bubbling Beebles (Urza's Destiny #29)
Catalog (Urza's Saga #64)
Cloak of Mists (Urza's Saga #65)
Confiscate (Commander Legends #62)
Crown of Flames (Invasion #142)
Disruptive Student (Urza's Saga #69)
Erratic Portal (Tempest Remastered #222)
Ertai (Vanguard Series #101)
Heightened Awareness (Prophecy #37)
Hermetic Study (Urza's Saga #78)
Holy Day (Invasion #20)
Levitation (Ninth Edition #83)
Lightning Bolt (Magic Online Promos #102261)
Meditate (Tempest Remastered #60)
Mental Discipline (Urza's Destiny #37)
Metalworker (Urza's Destiny #135)
Miscast (Core Set 2021 #57)
Mourning (Invasion #111)
Obliterate (Invasion #156)
Opportunity (Urza's Legacy #37)
Opposition (Urza's Destiny #40)
Ordered Migration (Invasion #258)
Paradigm Shift (Weatherlight #46)
Recover (Tenth Edition #172)
Relearn (Classic Sixth Edition #93)
Rewind (Urza's Saga #93)
Tidings (Commander 2018 #108)
Treacherous Link (Urza's Legacy #71)
Well-Laid Plans (Invasion #88)
Windfall (The Lost Caverns of Ixalan Commander #180)

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