Fae Lullaby

When a spell or ability an opponent controls causes you to discard this card, exile this card.
At the beginning of the next end step, you may cast this card from exile without paying its mana cost. If you do, draw a card.
Return to your hand up to three cards in your graveyard that you discarded this turn.
Their lullaby soothed the spirits into a slumber without fever, to a mind whole again.