MAGIC: THE GATHERING
Each instant and sorcery cards in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Past in Flames is great for continuing your spell-filled storm turn in Legacy Ad Nauseam Tendrils and Modern Blue-Red Storm. Lion's Eye Diamond becomes a Black Lotus and Gifts Ungiven loses the downside with Past in Flames in your arsenal.