15 cards where the card is in the spellbook for “key to the archive”

Approach of the Second Sun (Amonkhet #4)
Claim the Firstborn (Throne of Eldraine #118)
Counterspell (Commander Masters #81)
Day of Judgment (Magic 2012 #12)
Demonic Tutor (Commander Masters #150)
Despark (March of the Machine Commander #322)
Doom Blade (Iconic Masters #87)
Electrolyze (Iconic Masters #198)
Growth Spiral (The Lost Caverns of Ixalan Commander #270)
Krosan Grip (Commander 2021 #198)
Lightning Bolt (Ravnica: Clue Edition #141)
Lightning Helix (Murders at Karlov Manor #218)
Putrefy (Outlaws of Thunder Junction Commander #238)
Regrowth (Modern Horizons #175)
Time Warp (Tempest Remastered #74)

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