Storm: Storm is a triggered ability that functions while the spell is on the stack. "Storm" means "When you play this spell, put a copy of it onto the stack for each other spell that was played before it this turn. If the spell has any targets, you may choose new targets for any number of the copies." See rule 502.30, "Storm."
In order to play a spell, you actually have to put it on the stack and go through the process for playing spells.