These cards serve valuable utility in Dimir reanimator decks in Legacy, which use blues unmatched stack interaction with blacks hand disruption and Reanimate, which is trivial to set up with pieces like Entomb or Troll of Khazad-dm, or even targeting yourself with Thoughtseize
If you use it early, odds are the opponent will have a near full hand, allowing you to add a lot of mana to be able to cast out your key cards in your hand
Flavor-wise, these diverse spells are contained in the Biblioplex's archives in the campus of Strixhaven, and gameplay-wise, these special cards will appear in regular Strixhaven boosters, with one in each regular booster of the set and more in Collector's Boosters
It could even work for control decks that can use the flip side, Caetus, Sea Tyrant of Segovia to help keep mana open for counterspells