Only issue I see with Verblizzard/Verwater as AOEs starting off of Scatter would be how their Black/White Mana generation would work. The spells would either have to give both, or give neither. Normally we'd expect Verblizzard to give Black and Verwater to give White, but if Verwater requires 'Verwater Ready,' then its RNG dependent and cannot be relied upon to boost White Mana, whereas Verblizzard could be relied on to boost Black Mana.

Granted that's with thinking the Rotation is Scatter > Verblizzard (strong potency, high cast time) > Verwater (if procs, lower potency, faster cast time). I went this this idea as I imagine Blizzard to be more damaging than Water.