i'm just not so sure considering the nature of energy. clearly you wouldn't ever use it with surplus energy. i amended to include (cannot occur more than once every 20 seconds) however.My thought is that since faerie fire has no resource cost (other than the GCD), it's going to be optimal to play around its cooldown, making sure that you always have a free GCD when it comes up.
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good point. i'll just scrap that whole thing altogether.