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 Foil - £20.80
Lightly Played Foil - £17.70
Moderately Played Foil - £14.60
Heavily Played Foil - £10.40
Damaged Foil - £6.30
Near Mint Foil Non English - £20.80
Lightly Played Foil Non English - £17.70
Moderately Played Foil Non English - £14.60
Heavily Played Foil Non English - £10.40
Damaged Foil Non English - £6.30