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Here, we're talking about neutral creatures with Chain Lightning =)
But for the player, it's a completely different story.
Well, as you wish... An army with Chain Lightning is still more important than just Chain Lightning itself.
They're like kings... They should have an ability like Berserkers, i.e., uncontrollable. It would be a real party.
Now, let's try to find the smallest army to destroy 20 Chain Lightning creatures.
Yeah, like those... what were they called... some kind of bulls (maybe rabid ones?) :)
It's impossible to determine by eye, IMHO. Only through practice, using the editor.