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 - $13.80
Lightly Played - $13.10
Moderately Played - $12.40
Heavily Played - $11.00
Damaged - $9.00
NM-Mint Non English - $13.80
Lightly Played Non English - $13.10
Moderately Played Non English - $12.40
Heavily Played Non English - $11.00
Damaged Non English - $9.00
Foil Prices
NM-Mint Foil - $18.40
Lightly Played Foil - $17.50
Moderately Played Foil - $16.60
Heavily Played Foil - $14.70
Damaged Foil - $12.00
NM-Mint Foil Non English - $18.40
Lightly Played Foil Non English - $17.50
Moderately Played Foil Non English - $16.60
Heavily Played Foil Non English - $14.70
Damaged Foil Non English - $12.00