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So, if Isaiah enters battle with his Call on him, then by the time Jericho checks, he has access to any soul there. If no priest is in play, and Jericho is occupied, then things happen.
Well, except for the fact that Call negates Sites as well.
Huh, guess I was wrong. I thought that as long as they were optional abilities, choosing to use one was akin to choosing to use an artifact in your prep phase (i.e. drawing off gifts after playing MtM): you have now narrowed done your choices by doing so.