I DID IT! YESSS!!!! Many people said this fight is really hard, and I clear it with 3* servants and Mash. WOOOOHOOOO! These servants are done for the last 10 turns! Grazie Ragazzi! Mamma Mia, mamamma Mia.
Thank you guys! It really took some work to do this, but alhamdulillah, I pulled it off. @Faker69 I suspect it due to kind of self-defense. The longer we fight and hurt him, the more he realize he get attacked, so more likely to attack 3 times. I guess that's why at his last HP bar he will attack 3 times because he's in Danger.