Chandra, The Last Flame

+1: Discard a card, then you may cast a red Instant or Sorcery from your graveyard. If you do, exile that card.
-3: Chandra, The Last Flame deals X damage to any target, where X is 7 minus the number of cards in your hand.
-7: Search your library for up to three red spells and cast them without paying their mana costs.