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 - $9.00
Lightly Played - $8.75
Moderately Played - $6.75
Heavily Played - $5.50
Damaged - $3.75
Near Mint Non-English - $9.00
Lightly Played Non-English - $8.75
Moderately Played Non-English - $6.75
Heavily Played Non-English - $5.50
Damaged Non-English - $3.75