When Phyrexian Devourer's power is 7 or greater, sacrifice it. Exile the top card of your library: Put X +1/+1 counters on Phyrexian Devourer, where X is the exiled card's mana value.
Near Mint - $12.00
Lightly Played - $11.50
Moderately Played - $9.00
Heavily Played - $7.25
Damaged - $5.00
Near Mint Non-English - $12.00
Lightly Played Non-English - $11.50
Moderately Played Non-English - $9.00
Heavily Played Non-English - $7.25
Damaged Non-English - $5.00