[quote=IncredibleBee]
Aiisen, I like Sasaki Kojiro so I'm willing to allow him to be summoned as Assassin; we can just say the summoning ritual got bungled up. Again. That means we don't have to go out of our way to make sure one of our servants summons another servant. What I really need to clarify is his NP, since that seems to be an invention of your own. If I'm reading it right, he can't die? Or he has unlimited respawns, rather. Am I reading this right, or how many respawns were you thinking he should have?
[/quote]

He uses the dimensional refraction phenomenon to sublimate phantom mirages of himself, relating to the way that countless swordsmen that existed during that time period all had their heroic deeds attributed to Sasaki Kojiro, who was inherently a fictional existence. It is essentially what would happen if you attempted to replicate the phenomenon called Sasaki Kojiro using the all-powerful wish-granting ability of the Holy Grail.