Ok. I want this spell to deal 3 damage to one creature, 2 damage to two different creatures, neither of which are the first creature and then 1 damage to each of three different creatures, neither of which are the first three creatures that received 3 or 2 damage. Is there an elegant way to word that or have I reached the limit of what Magic is capable of describing through rules text?

Six different target creatures take 3, 2, 2, 1, 1 and 1 damage respectively.

It aint normal wording, but it seems to fit the situation. And to be a really difficult effect to use effectively.

I think the wording you have here is about right.

That is, assuming you want to require it to have all six targets. Which seems quite a harsh restriction; at that point you're pretty much Hex.

That is tricky. As it stands right now, you could probably get away with a casting cost of . Or, to put it another way, I'd rather have Pyroclasm in my deck. The times this does work should be explosive, though. And I suppose multiplayer should love this thing.

Though, if you want this card to work more often, you could just change the line to "and 1 damage to each other creature". 3,2,1 is nice and all, but I don't think the functionally easier to cast version is less interesting.