Omen of Clarity Talent

From wow.incgamers.com

Talent: Omen of Clarity Talent
Effect: Imbues the Druid with natural energy. Each of the Druid's melee attacks has a chance of causing the caster to enter a Clearcasting state. The Clearcasting state reduces the Mana, Rage or Energy cost of your next damage or healing spell or offensive ability by 100%. Lasts 30 min.
Statistics: N/A