This is a follow-up to a portion of this answer to a previous question of mine pertaining to the lowest possible achievable AC. The question is also slightly different as it pertains to magical armor and is limited in scope to Adventurers League play.
Currently, there are two monsters in the game with an ability to damage a Magical armor's AC value : Zorbos…
Destructive Claws. [...] one such item worn or carried by the creature (the targets choice), magically deteriorates, taking a permanent and cumulative -1 penalty to the AC it offers […]. Armor reduced to an AC of 10 [...] is destroyed.
...And the Demon Lord Juiblex :
Eject Slime. […] Any metal armor worn by the target takes a permanent −1 penalty to the AC it offers [...]. The penalty worsens each time a target is subjected to this effect. If the penalty on an object drops to −5, the object is destroyed.
The destruction clauses are different : one is when the Armor's AC=10, one is when the Armor's penalty=-5.
Now, let's say you take a +1 Plate magic item (AC of 19). Your DM somehow agrees to add a Zorbo into your game (if they can find a thematically appropriate justification), and said Zorbo successfully reduces your Magical Plate's AC 8 times, making it go to AC 11. Then, your DM somehow agrees to add the Demon Lord Juiblex into your game (again, with a thematically appropriate justification), which successfully reduces your Magical Plate's AC 4 times, making it go to AC 7. At this point, you go back to the Zorbo, who successfully reduces your Plate's AC once more. At this specific point, the armor's AC is already lower than 10, and its total penalty is already higher than 5, so, to my understanding, this new reduction doesn't activate either of the 2 destruction clauses. And thus, the Zorbo reduces it again, and again, and again, until the armor reaches a (potentially infinitely) negative AC value.
My question is : is there anything I forgot to consider -- anything that would make the above "negative AC armor" creation process not function within the scope of Adventurers League play ?
For the record, I want such negative AC armor on my Redemption Paladin to symbolize a divine punishment by his goddess (he's been naughty).