When Contagion Engine enters the battlefield, put a -1/-1 counter on each creature target player controls. {4}, {T}: Proliferate, then proliferate again. (Choose any number of permanents and/or players, then give each another counter of each kind already there. Then do it again.)
Near Mint - £3.60
Lightly Played - £3.10
Moderately Played - £2.60
Heavily Played - £1.80
Damaged - £1.10
Near Mint Non English - £3.60
Lightly Played Non English - £3.10
Moderately Played Non English - £2.60
Heavily Played Non English - £1.80
Damaged Non English - £1.10
Foil Prices
Near Mint Foil - £19.10
Lightly Played Foil - £16.20
Moderately Played Foil - £13.40
Heavily Played Foil - £9.60
Damaged Foil - £5.80
Near Mint Foil Non English - £19.10
Lightly Played Foil Non English - £16.20
Moderately Played Foil Non English - £13.40
Heavily Played Foil Non English - £9.60
Damaged Foil Non English - £5.80