Just a few more notes, now I have the time:
- Damage in -1/-1 runes to armour still counts as dealing damage, it’s just that the counters are… applied to the armour, I suppose. You are correct that an armoured 0 HP Glaxx is an exception here, though.
- Deathtouch rewording: personally I find this more confusing than the original text: “first point of damage destroys the recipient” heavily implies all the rest goes to overpower to me. I don’t think the new overpower text helps in this regard.
This reminds me that one of my pipe dreams was to essentially turn the ruling in this thread into a list of “unit tests”, removing any out-of-date ones along the way, with the intention of reducing the initial learning curve for people trying to make rules-enforced digital versions of Codex. It would be a long undertaking, though, and I don’t know whether people would use it.