Originally Posted by
Kevkul
Shadow Word: Pain and Vampiric Touch are lower priority, but Mind Blast and Shadow Word: Death are higher than Mind Flay Insanity. Essentially, if it doesn't generate a shadow orb, it's below Insanity.
Also, what shifts the stat priority isn't so much the 4pc as it is the 2pc. The 2pc increases the shadowy recall crit damage bonus by 40%, which makes crit more valuable. Otherwise mastery would win out, but as it is, this is the priority: Int > Spell Power > Hit (to 15%) > Haste (to GCD Cap, 18,215) > Crit = Mastery > Haste. But the difference between keeping mastery and crit balanced or favoring one more than the other is minimal anyway, so you can do pretty much whatever the hell you want.