The only reason I beat Shadow Herk from the Fuyuki 15AP without burning CSs even though my back row was full of unleveled servants I was friending was careful timing of skills.
Won with Lancer Cu at 300 HP and nothing else. :V
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You know I should go dig through the dll see if I can find how are cards shuffled.
E: Eh, it's a regular shuffle. Doesn't check previous turn results.