Hatwolf, Dragon Friend

{7}{w/b}{w/b}, {t}, Sacrifice Hatwolf, Dragon Friend:
Create a 3/3 blue Dragon creature token with hexproof, a 6/6 green Dragon creature token
with trample, a 7/7 white Dragon creature
token with first strike, a 10/10 black Dragon
creature token with menace.
When Hatwolf, Dragon friend, is put into the
graveyard by a source you don't control,
you may use its ability without paying its costs.