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 - £4.80
Lightly Played - £4.10
Moderately Played - £3.40
Heavily Played - £2.40
Damaged - £1.50
Near Mint Non English - £4.80
Lightly Played Non English - £4.10
Moderately Played Non English - £3.40
Heavily Played Non English - £2.40
Damaged Non English - £1.50
Foil Prices
Near Mint Foil - £22.50
Lightly Played Foil - £19.20
Moderately Played Foil - £15.80
Heavily Played Foil - £11.30
Damaged Foil - £6.80
Near Mint Foil Non English - £22.50
Lightly Played Foil Non English - £19.20
Moderately Played Foil Non English - £15.80
Heavily Played Foil Non English - £11.30
Damaged Foil Non English - £6.80