32 cards where the color identity ≤ BW and the text includes “whenever you cast” and the text includes “gain” and the text includes “life”

Aetherflux Reservoir (Kaladesh #192)
Bontu's Monument (Dominaria United Commander #179)
Bosom Buddy (Unhinged #3)
Contemplation (Stronghold #4)
Dawnhart Geist (Innistrad: Crimson Vow #8)
Defiler of Flesh (Dominaria United #90)
Diamond Mare (Foundations #672)
Doomskar Oracle (Kaldheim #10)
Entropic Eidolon (Dissension #45)
Forsaken Monument (Commander Masters #950)
God-Pharaoh's Faithful (Hour of Devastation #14)
Interplanar Beacon (Commander Masters #1004)
Lurking Spinecrawler (Alchemy: Murders at Karlov Manor #10)
Ojutai Exemplars (Dragons of Tarkir #27)
Prism Ring (Magic Origins #235)
Professor Onyx (Duskmourn: House of Horror Commander #153)
Psemilla, Meletian Poet (Foundations Jumpstart #31)
Sedgemoor Witch (Strixhaven: School of Mages #86)
Seeker of the Way (Double Masters 2022 #28)
Setessan Battle Priest (Theros #29)
Sigarda's Splendor (Innistrad: Midnight Hunt #33)
Silverquill Pledgemage (Strixhaven: School of Mages #233)
Staff of the Death Magus (Magic 2015 #232)
Staff of the Flame Magus (Magic 2015 #233)
Staff of the Mind Magus (Magic 2015 #234)
Staff of the Sun Magus (Magic 2015 #235)
Staff of the Wild Magus (Magic 2015 #236)
Student of Ojutai (Iconic Masters #33)
Tablet of the Guilds (Return to Ravnica #235)
Thalia's Geistcaller (Commander 2019 #7)
Thief of Hope (Modern Masters 2015 #100)
Tormented Hero (Theros #108)

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