Zennara, Weaver of Stories

{w}{u}{b}{r}{g}, {t}: Search your library for a planeswalker card and exile it, create a token
that's a nonlegendary copy of that planeswalker,
sacrifice it at the beginning of your next end step.
{5}, {t}: Shuffle a planeswalker you own in exile
into it's owner's library.
"So many wonderful stories to tell, now, how about
another one?"