Cone of Flame
Duel Decks Anthology, Jace vs. Chandra — Uncommon
Cone of Flame rulings:
7/18/2014 : Each of the three targets must be different. If there aren’t three different legal targets available, you can’t cast the spell.
7/18/2014 : If one or two of Cone of Flame’s targets are illegal when it resolves, you can’t change how much damage will be dealt to the remaining legal targets.