Letana, the Unwavering

Aura spells you cast cost {1} less to cast for each aura attached to Letana, the Unwavering.
If Letana would die or be put into exile from the battlefield, you may discard an enchantment card. If you do, return Letana to the battlefield tapped at the beginning of the next end step.
{2}{w/b}: Return target enchantment card from your graveyard to your hand.