Skill understanding

I'm curious how effective this would be as a skill.

Combat Mastery raise it by 2 points making it a 88% recovery rate with a cooldown of 16 seconds. It's a bit more viable. I'd assume it would be godly if you managed to get potential gear with +1/2 stats since it's plausible to get that cooldown to 9 seconds (level 13) or 2 seconds (level 14). I could potentially replace potions with the exception of 1/1 attacks or mana drain (which would technically disable your "HP potions").