37 cards where the text includes “search your library and/or graveyard for a card named”

Ajani's Aid (Aether Revolt #188)
Angrath's Fury (Rivals of Ixalan #204)
Ashiok's Forerunner (Theros Beyond Death #277)
Basri's Aegis (Core Set 2021 #322)
Chandra's Firemaw (Core Set 2021 #333)
Chandra's Flame Wave (Core Set 2020 #295)
Chandra's Outburst (Dominaria #276)
Domri's Nodorog (Ravnica Allegiance #272)
Dovin's Dismissal (Ravnica Allegiance #267)
Elspeth's Devotee (Theros Beyond Death #272)
Elspeth, Undaunted Hero (Theros Beyond Death #270)
Ethereal Elk (Core Set 2020 #299)
Garruk's Warsteed (Core Set 2021 #337)
Gideon's Battle Cry (War of the Spark #267)
Gideon's Resolve (Amonkhet #272)
Goldmane Griffin (Core Set 2020 #283)
Grand Master of Flowers (Adventures in the Forgotten Realms #17)
Grasping Current (Ixalan #282)
Jace's Ruse (War of the Spark #273)
Liberating Combustion (Kaladesh #267)
Liliana's Influence (Amonkhet #277)
Liliana's Scorn (Core Set 2021 #329)
Niambi, Faithful Healer (Dominaria #272)
Oko's Hospitality (Throne of Eldraine #312)
Ral's Dispersal (Guilds of Ravnica #266)
Rhythmic Water Vortex (Global Series Jiang Yanggu & Mu Yanling #18)
Rowan's Stalwarts (Throne of Eldraine #307)
Sorin's Guide (Core Set 2020 #292)
Sun-Blessed Mount (Ixalan #288)
Teferi's Wavecaster (Core Set 2021 #327)
Tezzeret's Betrayal (Aether Revolt #191)
The First Doctor (Doctor Who #128)
Tower Winder (Outlaws of Thunder Junction Commander #34)
Visage of Bolas (Hour of Devastation #208)
Vraska's Scorn (Rivals of Ixalan #200)
Vraska's Stoneglare (Guilds of Ravnica #272)
Yanling's Harbinger (Core Set 2020 #289)

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