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 - $39.600
Lightly Played - $31.700
Moderately Played - $27.800
Heavily Played - $23.800
Damaged - $19.800
Near Mint Spanish - $39.600
Lightly Played Spanish - $31.700
Moderately Played Spanish - $27.800
Heavily Played Spanish - $23.800
Damaged Spanish - $19.800