Beast shapeshifts against Dominate Mind
Until Mists of Pandaria, Dominate Mind (then called Mind Control) was only usable against humanoids, and also had a longer cast time of 2.5 seconds. Therefore, Druids and Shaman could become immune by shapeshifting into Beasts. With the expansion of the spell to cover all non-mechanical units, this strategy no longer works.
At the time, with careful timing and observation of the opposing priest's cast bar, they could even return to humanoid form to cast a few spells before returning to beast form if necessary. The priest was also prevented from pre-casting Mind Control against Beasts because of the invalid target.
Druids in [Bear Form], [Cat Form], [Travel Form], [Aquatic Form] and [Flight Form] are considered beasts. However, caught unawares, druids in humanoid form are just as susceptible to DM as any other class.
Shamans using [Ghost Wolf] are also classed as beasts. As a magical buff, Ghost Wolf can easily be dispelled by the priest, although the longer cast time of DM meant the shaman could simply re-buff. While shamans with [Ancestral Swiftness] could instantly reapply Ghost Wolf, for others it had a 2-second cast, giving quick priests a chance at DMing them between casts. On the downside, Ghost Wolf prevented the shaman from using any spells or abilities, and so was a heavy price to pay to avoid DM.
