Ancestral Knowledge

Enchantment

Cumulative upkeep

When Ancestral Knowledge enters, look at the top ten cards of your library, then exile any number of them and put the rest back on top of your library in any order.

When Ancestral Knowledge leaves the battlefield, shuffle your library.

Ancestral Knowledge is on the reserved list, which means WOTC has self-imposed restrictions from making functional reprints of this card.