Quote Originally Posted by Aggro_zombies
Sure, it can target nonred stuff, but it doesn't actually do anything to them if they aren't red. Free storm, sure, but...why not just play another draw spell?
You seem to misunderstand the cards' function. Hydroblast wouldn't be played to up your storm count. Instead it would be sideboarded to fight red decks with a cheap counter/ removal spell. Unlike Blue Elemental Blast it's not dead when going off in case you don't have a target for BEB, e.g. in a match against straight burn.