You pay the equip cost whenever you are willing and able, and an effect happens the hallmark of activated abilities
In order to get a sense of how many cards across all Magic sets feature books in their art, I searched the Gatherer and Scryfall card databases using the following bibliographic key words: book, tome, codex, library, librarian, archivist, archive, page, read, scroll, biblio, folio, grimoire Out of around 22,000 cards, this turned up approximately 100 cards
Each card also includes the D23 logo near the bottom of the image, representing its status as a promo card
And then the uncommon artifact is a 2-drop that will stop non-lands from arriving to the battlefield from libraries and graveyards and I don't have anything this would care about
The activated ability is basically just Syphon Mind, except you get your opponents cards instead of yours