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 - $4.100
Lightly Played - $3.300
Moderately Played - $2.900
Heavily Played - $2.500
Damaged - $2.100
Near Mint Spanish - $4.100
Lightly Played Spanish - $3.300
Moderately Played Spanish - $2.900
Heavily Played Spanish - $2.500
Damaged Spanish - $2.100