1) it is immaterial, and thus can't be healed
True, and a valid strategy. Not what I was addressing, though... (of course if my Bounty card were implemented, there'd be a way to heal through immortality)
2) it can be targeted, in which case, it is vulnerable to CC
Yes, healing or no, the Djinn could be taken out with a few damage spells... this is irrelevant to the discussion, since an Angel could heal the Djinn on the same turn the Lightning card is generated, and the opponent would never be presented with a sub-max-HP target, negating the HP loss balancing attempt, which is what my whole post was about.
furthermore, there is still the hand limit, quanta cost for the spell
We're discussing Lightning-on-a-stick here, and since it's a mono-Aether card, we need to address the virtual 6-card-limit bypass this represents. This is why we refer to the 6-card limit when discussing cards like Fractal and Parallel Universe - and in fact this same argument was brought to bear against my Hear Me Roar (
http://elementscommunity.org/forum/index.php/topic,18063.0.html) card idea a while ago... despite being a duo, I concluded Shockwave-on-a-stick was too powerful. There is a reason for the 6-card limit in most cases. No, Djinn isn't Lightning, but it
produces Lightnings, and that does bypass the rule.