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 - $12.90
Lightly Played - $12.30
Moderately Played - $11.60
Heavily Played - $10.40
Damaged - $8.40
NM-Mint Non English - $12.90
Lightly Played Non English - $12.30
Moderately Played Non English - $11.60
Heavily Played Non English - $10.40
Damaged Non English - $8.40
Foil Prices
NM-Mint Foil - $16.30
Lightly Played Foil - $15.40
Moderately Played Foil - $14.60
Heavily Played Foil - $13.00
Damaged Foil - $10.60
NM-Mint Foil Non English - $16.30
Lightly Played Foil Non English - $15.40
Moderately Played Foil Non English - $14.60
Heavily Played Foil Non English - $13.00
Damaged Foil Non English - $10.60