shadowleaf witches

coven—As long as you control three or more creatures with different powers, whenever one or
more creatures an player control attack or when
an opponent casts a noncreature spell, all
creatures the opponents control get-1/-0 until
end of turn.
at the beginning of your upkeep if your opponent
have 6 or more madness counters create a token
that is a copy of shadowleaf witches, that token
has "can't block and every time i become the
target of a spell or ability sacrifice me"