/focus [target=focus, noexists] [target=focus, dead] [target=focus, help]
/stopmacro [target=focus, noexists]
/cast [target=focus] Polymorph

"This uses macro options which are covered in Part II. The first line sets your focus to your current target if a) you don't already have a focus, b) your current focus is dead, or c) your current focus is friendly. If you aren't targeting anything, it will clear your focus. The second line keeps the macro from proceeding if you don't have a focus. Finally, it casts Polymorph on your focus. This gives you a one-button solution for your crowd control with focus. "

im a focus newb but this one seems good