I was wondering if a hexproof counter (from cards from Ikoria) on a noncreature permanent would give it hexproof. I would think it works like that, but when I read the mechanics article, I saw:
Note that if these counters end up on a noncreature permanent, it won't necessarily apply right away, but it will if the permanent becomes a creature. (The exceptions here are deathtouch and lifelink, which work even if they end up on a noncreature permanent, provided that noncreature permanent can deal damage somehow.)
Here hexproof isn't mentioned as a keyword counter that would do something on a noncreature permanent.
For example, I have an Ozolith and a Crystalline Giant on the battlefield. The giant has a hexproof counter on it and dies, moving all counters to the Ozolith. Can my opponent target my Ozolith (after the counter has been moved on it)?