[3.0] Berserker 2H Axe Bleeding/Sunder (Guardians/Shaper) W/ Uber Atziri Version

I have been attempting to get close to this build haha so far I'm lvl 58 (i'm a fairly new player) so gear is my problem but it is still going pretty good

my question is, even where i'm at now sunder goes through my mana really quickly, I only have Herald of Ash running. I thought about clarity but my int is way too low for that.

I don't have much mana leech either, just curious about other potential ways to off-set the mana drain, I'm often hitting my mana potions