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.)
NM-Mint Foil - $49.40
Lightly Played Foil - $44.40
Moderately Played Foil - $39.50
Heavily Played Foil - $34.60
Damaged Foil - $24.70
NM-Mint Foil Non English - $49.40
Lightly Played Foil Non English - $44.40
Moderately Played Foil Non English - $39.50
Heavily Played Foil Non English - $34.60
Damaged Foil Non English - $24.70