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 - $4.10
Lightly Played - $3.90
Moderately Played - $3.70
Heavily Played - $3.30
Damaged - $2.70
NM-Mint Non English - $4.10
Lightly Played Non English - $3.90
Moderately Played Non English - $3.70
Heavily Played Non English - $3.30
Damaged Non English - $2.70
Foil Prices
NM-Mint Foil - $5.20
Lightly Played Foil - $4.90
Moderately Played Foil - $4.70
Heavily Played Foil - $4.10
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 - $4.10
Damaged Foil Non English - $3.40