Lightning burns its own path.
097 KTK • ENSeb McKinnon
™ & © 1993—2014 Wizards of the Coast
Legal in: Modern,Khans of Tarkir Block,Urza Block,Legacy,Vintage,Commander
Oracle Text (click to copy):
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9/20/2014 You choose how many targets Arc Lightning has and how the damage is divided as you cast the spell. Each target must receive at least 1 damage. 9/20/2014 If some of the creatures are illegal targets as Arc Lightning tries to resolve, the original division of damage still applies but no damage is dealt to the illegal targets. If all targets are illegal, Arc Lightning is countered.