Dr.Strange vs Baron Mordo,Shamen,and Agatha Harkness

Agatha was alive 500 years before atlantis sunk,Mordo is kind of an evil manipulater of magic.And Shamen is the is the ultimate native american sorcerer.Can all three of them with such different back rounds defeat Strange?

Wait, are you using Ultimate Agatha? Because 616 wasn't from Atlantis, IIRC.