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 - $16.50
Lightly Played - $14.80
Moderately Played - $13.20
Heavily Played - $11.50
Damaged - $8.30
NM-Mint Non English - $16.50
Lightly Played Non English - $14.80
Moderately Played Non English - $13.20
Heavily Played Non English - $11.50
Damaged Non English - $8.30
Foil Prices
NM-Mint Foil - $31.00
Lightly Played Foil - $27.90
Moderately Played Foil - $24.80
Heavily Played Foil - $21.70
Damaged Foil - $15.50
NM-Mint Foil Non English - $31.00
Lightly Played Foil Non English - $27.90
Moderately Played Foil Non English - $24.80
Heavily Played Foil Non English - $21.70
Damaged Foil Non English - $15.50