Teferi's Lament

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
This spell may only be cast from exile.
Return all nonland permanents to their owners' hands. Each player shuffles their hand and graveyard into their library, then draws seven cards. Exile Teferi's Lament face down.
"A hero of his caliber does not forgive himself - I see in every one of his heroic deeds a somber requiem for his homeland."