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I'm 90% sure that's perfectly legal.
Bryon specifically ruled that you could not discard a captured male human to place a Lost Soul beneath owner's deck for the reasons I stated. Has this ruling been nullified?Arioch SA: If opponent does not have a prophet in play, you may discard a male human from your territory to place a Lost Soul beneath owner’s deck.
He said Arioch, he posted Ashpenaz.