Force Lightning

Choose one of the following and add that option's cost to this spell's base cost--

•+{0} Shock: deal 3 damage to target creature or planeswalker.
•+{1} Lightning: deal 4 damage to target creature or planeswalker, and 2 damage to up to one other target creature.
•+{1}{r}{u} Storm: deal 5 damage to target creature or planeswalker, and 2 damage to each other creature that player controls.