Unrelenting Storm

From wow.incgamers.com

Talent: Unrelenting Storm
Effect: Regenerate mana equal to a % of your Intellect every 5 sec, even while casting.
Statistics: Rank 1 = 2%, Rank 2 = 4%, Rank 3 = 6%, Rank 4 = 8%, Rank 5 = 10%.