MTG Salvation

2/25/2015 You choose whether Twin Bolt has one target that will be dealt 2 damage or two targets that will each be dealt 1 damage as you cast Twin Bolt.

2/25/2015 If you cast Twin Bolt with two targets and one of those targets becomes illegal before Twin Bolt resolves, the remaining legal target will be dealt 1 damage. You can’t change the original division of damage.