When Contagion Engine enters the battlefield, put a -1/-1 counter on each creature target player controls.
![4 4](/images/productsymbols/4_icon.gif)
,
![Tap t](/images/productsymbols/t_icon.gif)
: 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.)