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

Ajani's Pridemate (Foundations #135)
Ajani, Strength of the Pride (Core Set 2020 #2)
Amalia Benavides Aguirre (The Lost Caverns of Ixalan #221)
Archangel of Thune (Double Masters #5)
Attended Healer (Zendikar Rising #6)
A-Vampire Scrivener (Streets of New Capenna #A-98)
Bloodbond Vampire (Jumpstart #209)
Bloodthirsty Aerialist (Commander 2021 #136)
Cat Collector (Foundations #4)
Celestial Unicorn (Adventures in the Forgotten Realms #5)
Cleric Class (Adventures in the Forgotten Realms #6)
Cleric of Life's Bond (Zendikar Rising #222)
Cliffhaven Vampire (Oath of the Gatewatch #153)
Cradle of Vitality (Jumpstart #98)
Dawn of Hope (Guilds of Ravnica #8)
Defiant Bloodlord (Commander 2021 #142)
Elenda's Hierophant (The Lost Caverns of Ixalan Commander #71)
Enduring Tenacity (Duskmourn: House of Horror #95)
Epicure of Blood (Commander 2021 #143)
Essence Channeler (Bloomburrow #12)
Exemplar of Light (Foundations #11)
Famished Paladin (Rivals of Ixalan #8)
Field-Tested Frying Pan (Tales of Middle-earth Commander #11)
Fiendish Panda (Foundations #120)
Gideon's Company (War of the Spark #268)
Golden Sidekick (Alchemy: Duskmourn #23)
Hallowed Priest (Arena Beginner Set #9)
Heliod, Sun-Crowned (Commander Masters #29)
Kalastria Nightwatch (Jumpstart #245)
Karlov of the Ghost Council (Ravnica Remastered #193)
Lich's Mastery (Dominaria #98)
Light of Promise (Core Set 2021 #25)
Malakir Familiar (Jumpstart #253)
Marauding Blight-Priest (Foundations #178)
Nazar, the Velvet Fang (Foundations Jumpstart #43)
Nirkana Assassin (Battle for Zendikar #118)
Nykthos Paragon (Modern Horizons 2 #22)
Qala, Ajani's Pridemate (Foundations Jumpstart #32)
Ratchet, Field Medic // Ratchet, Rescue Racer (Transformers #2)
Ratchet, Field Medic // Ratchet, Rescue Racer (Transformers #2)
Rodolf Duskbringer (Foundations Jumpstart #482)
Sanguine Bond (Commander 2021 #153)
Scion of the Swarm (Zendikar Rising #121)
Serene Steward (Battle for Zendikar #46)
Starscape Cleric (Bloomburrow #116)
Sunbond (Born of the Gods #28)
Twinblade Paladin (Foundations #503)
Vampire Scrivener (Streets of New Capenna #98)
Vanguard Seraph (Foundations #28)
Veinwitch Coven (Outlaws of Thunder Junction Commander #151)
Vito, Thorn of the Dusk Rose (Core Set 2021 #127)
Vizkopa Guildmage (Iconic Masters #211)
Voice of the Blessed (Innistrad: Crimson Vow #44)
Wall of Limbs (Magic 2015 #121)
Well of Lost Dreams (Commander 2021 #275)

Though this query has ended, its relics still slumber in New Argive.