The following Stat Priority is developed using SimC with the BiS raid profile. Since the value of stats depends on your character's current state, we highly encourage using SimulationCraft to generate personalized stat weights for your character.
Haste increases attack and spell casting speed, adds additional damage and healing to DoTs and HoTs, and reduces the GCD.
Agility increases your attack power and the damage dealt by your abilities.
Mastery provides a passive bonus to your character based on your specialization. increases your chance to activate and while increasing all Fire, Frost, and Nature damage dealt.
Versatility increases your damage, healing, and absorption done and decreases damage received.
Critical Strike increase the chance for your spells and attacks to critically hit for additional damage and healing.