Thought i'd share this macro. It casts MD on your focus target, uses a trinket then assists the focus target with a single click. For this macro to work, your tank must be your focus target, though it would also work with the actual player name substituted in. Any trinket could be used in place of the brooch but i use an AP trinket for extra threat on the MD.
#showtooltip
/target focus
/cast Misdirection
/stopcasting
/use Bloodlust Brooch
/stopcasting
/assist focus