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.
NM-Mint - $14.30
Lightly Played - $13.60
Moderately Played - $12.90
Heavily Played - $11.50
Damaged - $9.30
NM-Mint Non English - $14.30
Lightly Played Non English - $13.60
Moderately Played Non English - $12.90
Heavily Played Non English - $11.50
Damaged Non English - $9.30