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 - $59.10
Lightly Played Foil - $53.20
Moderately Played Foil - $47.30
Heavily Played Foil - $41.40
Damaged Foil - $29.60
NM-Mint Foil Non English - $59.10
Lightly Played Foil Non English - $53.20
Moderately Played Foil Non English - $47.30
Heavily Played Foil Non English - $41.40
Damaged Foil Non English - $29.60