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.)
Near Mint - $4.25
Lightly Played - $4.00
Moderately Played - $3.25
Heavily Played - $2.50
Damaged - $2.25
Near Mint Non-English - $4.25
Lightly Played Non-English - $4.00
Moderately Played Non-English - $3.25
Heavily Played Non-English - $2.50
Damaged Non-English - $2.25
Foil Prices
Near Mint Foil - $4.75
Lightly Played Foil - $4.50
Moderately Played Foil - $4.00
Heavily Played Foil - $3.00
Damaged Foil - $2.50
Near Mint Foil Non-English - $4.75
Lightly Played Foil Non-English - $4.50
Moderately Played Foil Non-English - $4.00
Heavily Played Foil Non-English - $3.00
Damaged Foil Non-English - $2.50