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Once you play the dominant you've moved past the Artifact maintenance portion of your prep phase.
For me, that raises this question. What if I put a temple/tabernacle in play after I perform my Artifact maintenance? The SA says I can activate an Art on my Fort. Does this give us a loophole?
I think this really boils down to a single question: When you deactivate an artifact, do you have to immediately activate a new one, or do Dominants not interrupt the fact that you are still deciding which artifact to have active?
You may place any number of fortresses on the table as described on the fortress. You may add or remove cards in a fortress as described on the fortress. You may only hold your own cards in a fortress unless a card states otherwise. A fortress may not be used to gain access to an opponent’s sites.
Well I know it wouldn't work for Solomon's Temple, as that one explicitly says "secong" artifact Though i am a bit unsure of the others... This could be a nice combo if it works.
Also, you can put an Artifact in Solomon's Temple if you don't have another one active. Second doesn't really mean second for Solomon's Temple according to this thread.