HELP! I became a Saberface in Another Grail War!

Once, the Master of Assassin summoned a poison girl who killed him with a kiss. But in this timeline, he summons a shooting star...with better results? She claims to not be the King of Knights, but why does she have Excalibur? And why does she hate her face so much? Together they'll have to face the others, Manaka Sajyou (pls nerf), and of course, the REAL Saber. Will they win?