>>535735625
Conversely speaking, the later heroes like the french ones it sent would fare better due to that. Muramasa would have to start spending mana to use his skills and wouldn't have a damage boost. As seen in LB6, that still makes him a big deal since he could survive and recover wounds that would usually kill him, but he'd be more manageable since it isn't something instantaneous like the Dark Jesuit Sorcery'd servants from Shimousa.
Take Sanson for example: EMIYA has luck as low as E. It's doubtful he or Shirou could survive La Mort Espoir if gets casted. Muramasa should survive like he did, but would be neutered for some time.