Bag of Holding

Whenever you discard a card, exile that card from your graveyard.
{2}, {t}: Draw a card, then discard a card.
{4}, {t}, Sacrifice Bag of Holding: Return all cards exiled with Bag of Holding
to their owner's hand.
"Within the raven's grasp, endless secrets hide,
A bag of holding, where worlds of magic reside."