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 - $6.20
Lightly Played - $5.60
Moderately Played - $5.00
Heavily Played - $4.30
Damaged - $3.10
NM-Mint Non English - $6.20
Lightly Played Non English - $5.60
Moderately Played Non English - $5.00
Heavily Played Non English - $4.30
Damaged Non English - $3.10
Foil Prices
NM-Mint Foil - $16.60
Lightly Played Foil - $15.00
Moderately Played Foil - $13.30
Heavily Played Foil - $11.60
Damaged Foil - $8.30
NM-Mint Foil Non English - $16.60
Lightly Played Foil Non English - $15.00
Moderately Played Foil Non English - $13.30
Heavily Played Foil Non English - $11.60
Damaged Foil Non English - $8.30