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 converted mana cost.
Near Mint - $11.00
Lightly Played - $10.50
Moderately Played - $9.00
Heavily Played - $6.75
Damaged - $5.50
Near Mint Non-English - $11.00
Lightly Played Non-English - $10.50
Moderately Played Non-English - $9.00
Heavily Played Non-English - $6.75
Damaged Non-English - $5.50