Contagion Engine 145/249 (The List Reprints)

When this artifact enters, put a -1/-1 counter on each creature target player controls. {4}, {T}: Proliferate twice. (Choose any number of permanents and/or players, then give each another counter of each kind already there. Then do it again.)

NM - $34.00
LP - $27.20
MP - $20.40
HP - $13.60
DMG - $6.80