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.
NM-Mint - $10.00
Lightly Played - $9.00
Moderately Played - $8.00
Heavily Played - $7.00
Damaged - $5.00
NM-Mint Non English - $10.00
Lightly Played Non English - $9.00
Moderately Played Non English - $8.00
Heavily Played Non English - $7.00
Damaged Non English - $5.00