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 - $2.300
Lightly Played - $1.800
Moderately Played - $1.600
Heavily Played - $1.400
Damaged - $1.200
Near Mint Spanish - $2.300
Lightly Played Spanish - $1.800
Moderately Played Spanish - $1.600
Heavily Played Spanish - $1.400
Damaged Spanish - $1.200