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 - $4.70
Lightly Played - $4.20
Moderately Played - $3.80
Heavily Played - $3.30
Damaged - $2.40
NM-Mint Non English - $4.70
Lightly Played Non English - $4.20
Moderately Played Non English - $3.80
Heavily Played Non English - $3.30
Damaged Non English - $2.40
Foil Prices
NM-Mint Foil - $4.90
Lightly Played Foil - $4.40
Moderately Played Foil - $3.90
Heavily Played Foil - $3.40
Damaged Foil - $2.50
NM-Mint Foil Non English - $4.90
Lightly Played Foil Non English - $4.40
Moderately Played Foil Non English - $3.90
Heavily Played Foil Non English - $3.40
Damaged Foil Non English - $2.50