Mm, we've had some Shockwave-on-a-stick cards before. They're a terrible idea, considering how easy it is to freeze a lot of creatures between Squid, Ice Bolt and especially Freeze and Ice Shield. I don't quite see how a Sonar could be that powerful either. How do you weaponize something like that?
I've thought about making a Sound Mage that could do exactly this: Shockwave effect without the damage, but after playing against Permafrost, I went "...no".