It's a somewhat common trope in fantasy that wizards can see Death (as in the anthropomorphic representation of death) outside of his domain.
I can't find the episode that establishes this.
I know when Betty is taking The Ice king to Bella Noche, Death appears to Him and taunts him. I don't think this counts as he had
Lost his powers
So is there an earlier episode in remembering that watermarked this? 'Wizard Eyes' doesn't count unless Death specifically appears.