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 - $6.80
Near Mint Non-English - $6.80
Lightly Played - $6.20
Lightly Played Non-English - $6.20
Played - $4.80
Played Non-English - $4.80
Heavily Played - $4.10
Heavily Played Non-English - $4.10
Damaged - $3.40
Damaged Non-English - $3.40
Foil Prices
Near Mint Foil - $21.30
Near Mint Foil Non-English - $21.30
Lightly Played Foil - $19.20
Lightly Played Foil Non-English - $19.20
Played Foil - $14.90
Played Foil Non-English - $14.90
Heavily Played Foil - $12.80
Heavily Played Foil Non-English - $12.80
Damaged Foil - $10.70
Damaged Foil Non-English - $10.70