Mmh it's not like
Panharmonicon is the only win condiction. Bolas is another one,
Marionette master is pretty deadly by herself, and the cards work even without the artifact. But of course their potential is needed.
Another fact: Want to put
Dispossess in the deck? How many copies? Every copy except the first one is useless, there is only one artifact type in the deck. And if you oly use one copy, it may arrive too late, because it doesn't destroy the ones on the battlefield