Biblioplex Tomekeeper is a common Artifact Creature — Construct card from Secrets of Strixhaven (SOS), collector number 247. Current market price: $0.22 (foil $0.24), TCGplayer market prices via Scryfall.
When this creature enters, choose up to one — • Target creature becomes prepared. (Only creatures with prepare spells can become prepared.) • Target creature becomes unprepared.