Ok I think I understand what he wants is "Negate all 0-cost abilities"
No - There is a slight difference between passive abilities and 0-cost abilities, as SoR can make any skills 0-cost. Also is it clearer and more succinct to just put what many other have already realised it to mean: passive abilities.
But I agree that this doesnt thematically make sense. Why does sky stop a scorpion from causing poisoning when its eaten?
Re description Try:
"Negate all passive abilities".
OR
"Negate all passive abilities.
units immune."