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 - $13.00
Lightly Played - $12.40
Moderately Played - $11.70
Heavily Played - $10.40
Damaged - $8.50
NM-Mint Non English - $13.00
Lightly Played Non English - $12.40
Moderately Played Non English - $11.70
Heavily Played Non English - $10.40
Damaged Non English - $8.50
Foil Prices
NM-Mint Foil - $12.80
Lightly Played Foil - $12.20
Moderately Played Foil - $11.50
Heavily Played Foil - $10.30
Damaged Foil - $8.30
NM-Mint Foil Non English - $12.80
Lightly Played Foil Non English - $12.20
Moderately Played Foil Non English - $11.50
Heavily Played Foil Non English - $10.30
Damaged Foil Non English - $8.30