Quest for Ancient Secrets is a uncommon Enchantment card from Zendikar (ZEN), collector number 59. Current market price: $0.19 (foil $3.44), TCGplayer market prices via Scryfall.
Whenever a card is put into your graveyard from anywhere, you may put a quest counter on this enchantment. Remove five quest counters from this enchantment and sacrifice it: Target player shuffles their graveyard into their library.