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 - $19.40
Lightly Played - $17.50
Played - $13.60
Heavily Played - $11.70
Damaged - $9.70
Near Mint Non-English - $19.40
Lightly Played Non-English - $17.50
Played Non-English - $13.60
Heavily Played Non-English - $11.70
Damaged Non-English - $9.70