Ashara, The Night's Tempest

When Ashara, The Night's Tempest enters the battlefield, you may exile a Storm card from your graveyard.
{5}, {t}: Cast a copy of a the spell exiled with Ashara, The Night's Tempest without paying its mana cost.
When Ashara, The Night's Tempest dies, you may cast the exiled spell without paying its mana cost.