Convoking Mandos Hall

As an additional cost to cast this spell, sacrifice a legendary creature.
Add {w}{w}{b}{b}{g}{g} to your mana pool. Until end
of turn, each legendary card in your graveyard
gains '"you may play this card from your
graveyard.".
"He is the keeper of the Houses of the Dead, and the summoner of the spirits of the slain."
— The Silmarillion