Storm is a keyword ability that first appeared in Scourge and made a return visit in Time Spiral block. Storm is also a triggered ability that triggers when a spell with storm is cast. This trigger will go on the stack on top of the spell itself and it will resolve first. When this trigger resolves a copy of the storm spell is put on the stack for each spell that was cast before the storm spell. Then each of these copies and the original spell will resolve. The storm ability only counts spells
Three of the official shortcuts deal with announcing or asking about choices before those choices need to be made. If you cast a spell or activate an ability and declare choices that aren't normally made until that spell or ability resolves, you have to abide by those declared choices unless another player responds to that spell or ability. For example, if you cast Memoricide by saying " your Vengevines", you have to name Vengevine when Memoricide resolves unless your opponent responds to the spell.