Oristh, Guardian of Azda Peak

When Oristh, Guardian of Azda Peak enters the
battlefield, create a 1/1 black Bird snow creature
token with flying for each nontoken snow
permanent you control.
{1}{b}, Sacrifice a snow permanent: Target
creature gets -2/-2 until end of turn.
"What quest do you bear here, traveler? These peaks
do not yield."