No doubt it is nasty and will surprise people, but really you are paying a premium for surprising your foe. A conclave does roughly the same thing for cheaper, so you have to rely on your opponent not knowing that weird bunch of sisters and robed guys is a "deathstar", and allowing you to get into position for maximum damage to make up the point spread.
I don't think it will work often enough to be better than a conclave, really. Might be fun to whip out now and then, though. Especially against hordes.
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