When Contagion Engine enters the battlefield, put a -1/-1 counter on each creature target player controls.
{4}, {T}: Proliferate, then proliferate again. (You choose any number of permanents and/or players with counters on them, then give each another counter of a kind already there. Then do it again.)
Near Mint - $5.75
Near Mint Non-English - $5.75
Lightly Played - $5.50
Lightly Played Non-English - $5.50
Moderately Played - $4.50
Moderately Played Non-English - $4.50
Heavily Played - $3.50
Heavily Played Non-English - $3.50
Damaged - $3.00
Damaged Non-English - $3.00
Foil Prices
Near Mint Foil - $16.75
Near Mint Foil Non-English - $16.75
Lightly Played Foil - $15.75
Lightly Played Foil Non-English - $15.75
Moderately Played Foil - $13.25
Moderately Played Foil Non-English - $13.25
Heavily Played Foil - $10.00
Heavily Played Foil Non-English - $10.00
Damaged Foil - $8.50
Damaged Foil Non-English - $8.50