Melissa, the Dancing Scythe

Menace
Whenever a planeswalker activates a loyalty
ability, you may pay {1}{u}{b}{r}, copy that ability
and you may choose new targets for the copy.
{4}{u}{u}{b}{b}{r}{r}: Create token that are copies of
each planeswalker on the battlefield, except
they're not legendary. During the end of turn, if
you use this ability, transform Melissa, the
Dancing Scythe.