Witherlark

Flying
When Witherlark enters the battlefield choose
two creature types.
When Witherlark leaves the battlefield creatures
of the chosen types get -3/-3 until end of turn.
Grave Evoke {1}{w/b}{w/b} (You may cast this spell from
the chaotic graveyard for its grave evoke cost. If you
do, it's exiled when it enters the battlefield.)