Spirit Tap

From wow.incgamers.com

Talent: Spirit Tap
Effect: Gives you a % chance to gain a 100% bonus to your Spirit after killing a target that yields experience or Honor. For the duration, your Mana will regenerate at a 50% rate while casting. Lasts 15 sec.
Statistics: Rank 1 = 20%, Rank 2 = 40%, Rank 3 = 60%, Rank 4 = 80%, Rank 5 = 100%.