Incognito Citizen

Incognito Citizen enters the battlefield with X -1/-1 counters on it.
As long as Incognito Citizen has one -1/-1 counter on it, it has skulk.
As long as Incognito Citizen has two or more -1/-1 counters on it, it is unblockable.
"Why is it that they come here every week, and still I haven't seen their face?"
--Urcole, Bartender