The only way I can see is if you hit it and look at the change in health. But ideally I would just say - ignore this buffed unit.
We haven’t exposed one, except for the spellcaster using this.canCast('shrink', target)
. We were considering making target.hasEffect('shrink')
available, but then the API gets cluttered, and for Dungeon Arena, we wanted to keep it simpler. I think Brawlwood lets you do this, though.