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 - $41.500
Lightly Played - $33.200
Moderately Played - $29.100
Heavily Played - $24.900
Damaged - $20.800
Near Mint Spanish - $41.500
Lightly Played Spanish - $33.200
Moderately Played Spanish - $29.100
Heavily Played Spanish - $24.900
Damaged Spanish - $20.800