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Actually....you can't.Because of the wording on it, you have to activate it on the artifact pile and then move it to the High Priest.rust me, I know...I tried this in my T2 deck but was told I couldn't (not only that, but if you do put it on the priest, the next turn, you have to deactivate it in your artifact pile).
Here's the tread with the ruling.
It isn't useless. PB remains active on your High Priest indefinitely..right? Then you could activate a different artifact next turn.
...high-level tournament host...