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 - $3.60
Lightly Played - $3.40
Moderately Played - $3.20
Heavily Played - $2.90
Damaged - $2.30
NM-Mint Non English - $3.60
Lightly Played Non English - $3.40
Moderately Played Non English - $3.20
Heavily Played Non English - $2.90
Damaged Non English - $2.30
Foil Prices
NM-Mint Foil - $5.20
Lightly Played Foil - $4.90
Moderately Played Foil - $4.70
Heavily Played Foil - $4.20
Damaged Foil - $3.40
NM-Mint Foil Non English - $5.20
Lightly Played Foil Non English - $4.90
Moderately Played Foil Non English - $4.70
Heavily Played Foil Non English - $4.20
Damaged Foil Non English - $3.40