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 - $41.50
Lightly Played - $39.40
Moderately Played - $37.30
Heavily Played - $33.20
Damaged - $27.00
NM-Mint Non English - $41.50
Lightly Played Non English - $39.40
Moderately Played Non English - $37.30
Heavily Played Non English - $33.20
Damaged Non English - $27.00