Man With the Thistledown Hair

If it's neither day nor night when Man With the
Thistledown Hair enters the battlefield, it
becomes night.
Whenever it becomes night, place a -1/-1 counter
on target creature, then each creature with a
-1/-1 counter on it phases out.
Whenever it becomes day, all phased out
creatures with a -1/-1 counter on it, phase in.