Chandra, the Free

+2: The next instant or sorcery you cast costs one red mana less until end of turn.
0: Discard two cards, draw a card. If that card is a red non-creature spell you may reveal it and deal 2 damage to target creature.
-4: Deal 3 damage to target creature or player. Exile Chandra, the Free, then return it to the battlefield transformed.