Against Phantasm mages:

Liches, Elementals, Mindrippers, Archangels, Elementals, Unicorns, Wraiths

Except for the Liches always remaining at first stack, and MR at 3rd, the rest are all interchangeable.

Others:

Archangels, Liches, Water Elementals, Unicorns, Zombies, Mindrippers Knights, Skeletons, Salamanders, Dryads

Note: The best stacking is one where you have found your own preference.

-- Anonymous, January 07, 2001