Code:
#showtooltip Ambush
/console SET Sound_SFXVolume 0
/cast Premeditation
/cast Shadowstep
/cast Ambush
/console SET Sound_SFXVolume 1
/run UIErrorsFrame:Clear()
Removes "That ability is not ready yet" speeches, clears any "Ability not ready yet" error messages, and (assuming both Premeditation and Shadowstep are off the global cooldown) always casts Ambush and whenever available, Premeditation and Shadowstep.