No, AST.... And in fact Healer as whole doesn't need RNG.
It's like going to a doctor that will randomly give you a drug.... It's just plain and simple moronic.
Healer must be the most stable job of all, and RNg is not what i call stable...
And you know what it's funny? it that you will tell people to never use Cure I and BeneficI because the RNG on the proc is crap (and the MP cost VS Heal is not good), but RNG on cards if fine....
Seriously, make your mind.