Ovale Spell Priority is a World of Warcraft add-on that displays icons using a configurable script. Default scripts are available for most classes and specs, imported from SimulationCraft, that display the most appropriate spell to cast. See Curse for more information or read the forums.
This page allows to import Mist of Pandaria SimulationCraft scripts to Ovale Spell Priority. Simply paste the full Simulationcraft profile in the first text area and click Convert. In game, type /ovale code and paste the second text area content in the pop-up that appears, and confirm.