I did add in there single target counterparts that are triggered by Verfire/Verstone, which could have a slightly less RNG %, and trigger an MP Siphon effect too. Again, it might be too much RNG? Not really, if for example 50% chance to trigger Verfire/Verstone, and as Sequora stated below, have Verwater/Verblizzard be a 20% trigger, that 20% COULD potentially help MP depletion.
But again, this is adding a new spell and RNG rotation, which I doubt we'll see until 6.0, so we're more than likely going to just see reduced MP cost of spells...
I still want Verwater/Verblizzard! Come on SE! Let's make it happen.