Contagion Engine

Macchina del Contagio (Contagion Engine) (it)

Artifact (CMC 6)
When Contagion Engine enters the battlefield, put a -1/-1 counter on each creature target player controls.
, : 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.)