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 - $6.00
Lightly Played - $5.40
Played - $4.20
Heavily Played - $3.60
Damaged - $3.00
Near Mint Non-English - $6.00
Lightly Played Non-English - $5.40
Played Non-English - $4.20
Heavily Played Non-English - $3.60
Damaged Non-English - $3.00
Foil Prices
Near Mint Foil - $7.40
Lightly Played Foil - $6.60
Played Foil - $5.20
Heavily Played Foil - $4.40
Damaged Foil - $3.70
Near Mint Foil Non-English - $7.40
Lightly Played Foil Non-English - $6.60
Played Foil Non-English - $5.20
Heavily Played Foil Non-English - $4.40
Damaged Foil Non-English - $3.70