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 - $10.50
Lightly Played - $10.00
Moderately Played - $8.00
Heavily Played - $6.50
Damaged - $4.25
Near Mint Non-English - $10.50
Lightly Played Non-English - $10.00
Moderately Played Non-English - $8.00
Heavily Played Non-English - $6.50
Damaged Non-English - $4.25