Atarka, seigneur-dragon

Text:

Rulings:

• 2/25/2015 You choose how many targets the ability has and how the damage is divided as you put the ability on the stack. Each target must receive at least 1 damage.
• 2/25/2015 If some of the targets are illegal targets as the ability tries to resolve, the original division of damage still applies but no damage is dealt to the illegal targets. If all targets are illegal, the ability doesn’t resolve.