@macaco111 That isn't "saber" though, it is berserker.
Mysterious Heroine X = Assassin Mysterious Heroine Z = Assassin Mysterious Heroine X Alter = Berserker
We really shouldn't get any hits for these when we do a search for Saber. As is, they should have their own character tags. As is there are some Heroine X doujin you can't find when searching for the character on this site simply because they haven't created a character tag for her.