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 - £3.70
Lightly Played - £3.10
Moderately Played - £2.60
Heavily Played - £1.80
Damaged - £1.10
Near Mint Non English - £3.70
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 - £15.60
Lightly Played Foil - £13.20
Moderately Played Foil - £10.90
Heavily Played Foil - £7.80
Damaged Foil - £4.70
Near Mint Foil Non English - £15.60
Lightly Played Foil Non English - £13.20
Moderately Played Foil Non English - £10.90
Heavily Played Foil Non English - £7.80
Damaged Foil Non English - £4.70