Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) When Ancestral Knowledge enters the battlefield, 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.
Near Mint - $4.800
Lightly Played - $3.900
Moderately Played - $3.400
Heavily Played - $2.900
Damaged - $2.500
Near Mint Spanish - $4.800
Lightly Played Spanish - $3.900
Moderately Played Spanish - $3.400
Heavily Played Spanish - $2.900
Damaged Spanish - $2.500