So after you unlock the Talon's Vengeance Faction, you can farm Mark of Prey via Ivory Talon.
Sadly I do not have found a way to farm the first 90 marks quick, so you have to do them the normal way.
After you got to Honored tho, you can buy Ivory Feather which does work in BG's and procs on every single lasthit on every unit.
And while it does indeed work on totems & pets as well, the quickest way is to farm neutral mobs in Alterac Valley
Dont forget to use a reputation buff before using the Marks. Darkmoon Fairy or Hallow's End both give 10%.