Chaos: Whenever you roll Chaos, destroy all nonland permanents with converted mana cost less then the number of Rumble counters on Etiris Factory
While in Midnight Hunt you may have been drafting dedicated Dimir zombie-themed decks with lots of Decayed cards, in this format youll find less Decayed cards on average
Cards that destroy enchantments, remove creatures from the game or restore life points are reactionary and considered a "dead" slot in any deck
If you want to try the new Nevinyrral, maybe focus on a zombie tribal deck with a way to make a bunch of tokens in the command zone, rather than a strict Stax-style lockdown
Otherwise, I would choose Thoughtseize over it
For a visual overview of all the mechanics, check out the video below: Battles Phyrexia had success invading Mirrodin, so they're trying it again