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 - £12.40
Lightly Played - £10.60
Moderately Played - £8.70
Heavily Played - £6.20
Damaged - £3.80
Near Mint Non English - £12.40
Lightly Played Non English - £10.60
Moderately Played Non English - £8.70
Heavily Played Non English - £6.20
Damaged Non English - £3.80