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 - $11.70
Lightly Played - $11.10
Moderately Played - $10.60
Heavily Played - $9.40
Damaged - $7.60
NM-Mint Non English - $11.70
Lightly Played Non English - $11.10
Moderately Played Non English - $10.60
Heavily Played Non English - $9.40
Damaged Non English - $7.60