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 - $14.60
Lightly Played - $13.10
Moderately Played - $11.70
Heavily Played - $10.20
Damaged - $7.30
NM-Mint Non English - $14.60
Lightly Played Non English - $13.10
Moderately Played Non English - $11.70
Heavily Played Non English - $10.20
Damaged Non English - $7.30
Foil Prices
NM-Mint Foil - $19.30
Lightly Played Foil - $17.40
Moderately Played Foil - $15.50
Heavily Played Foil - $13.50
Damaged Foil - $9.70
NM-Mint Foil Non English - $19.30
Lightly Played Foil Non English - $17.40
Moderately Played Foil Non English - $15.50
Heavily Played Foil Non English - $13.50
Damaged Foil Non English - $9.70