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 - £10.10
Lightly Played - £8.60
Moderately Played - £7.10
Heavily Played - £5.10
Damaged - £3.10
Near Mint Non English - £10.10
Lightly Played Non English - £8.60
Moderately Played Non English - £7.10
Heavily Played Non English - £5.10
Damaged Non English - £3.10