The Biblioplex is a rare Land card from Strixhaven: School of Mages (STX), collector number 264. Current market price: $0.22 (foil $0.35), TCGplayer market prices via Scryfall.
{T}: Add {C}. {2}, {T}: Look at the top card of your library. If it's an instant or sorcery card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard. Activate only if you have exactly zero or seven cards in hand.