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 - $6.000
Lightly Played - $4.800
Moderately Played - $4.200
Heavily Played - $3.600
Damaged - $3.000
Near Mint Spanish - $6.000
Lightly Played Spanish - $4.800
Moderately Played Spanish - $4.200
Heavily Played Spanish - $3.600
Damaged Spanish - $3.000