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.
Near Mint - £12.00
Lightly Played - £10.20
Moderately Played - £8.40
Heavily Played - £6.00
Damaged - £3.60
Near Mint Non English - £12.00
Lightly Played Non English - £10.20
Moderately Played Non English - £8.40
Heavily Played Non English - £6.00
Damaged Non English - £3.60