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 - $12.50
Moderately Played - $11.10
Heavily Played - $9.70
Damaged - $6.90
NM-Mint Non English - $13.80
Lightly Played Non English - $12.50
Moderately Played Non English - $11.10
Heavily Played Non English - $9.70
Damaged Non English - $6.90
Foil Prices
NM-Mint Foil - $29.90
Lightly Played Foil - $26.90
Moderately Played Foil - $23.90
Heavily Played Foil - $20.90
Damaged Foil - $15.00
NM-Mint Foil Non English - $29.90
Lightly Played Foil Non English - $26.90
Moderately Played Foil Non English - $23.90
Heavily Played Foil Non English - $20.90
Damaged Foil Non English - $15.00