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 - £23.80
Lightly Played Foil - £20.30
Moderately Played Foil - £16.70
Heavily Played Foil - £11.90
Damaged Foil - £7.20
Near Mint Foil Non English - £23.80
Lightly Played Foil Non English - £20.30
Moderately Played Foil Non English - £16.70
Heavily Played Foil Non English - £11.90
Damaged Foil Non English - £7.20