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Assuming you constantly hit 3 enemies per scythe attack, at 14+ Wind Prayers, the energy gain from this skill is roughly equivalent to 25 pips of energy regeneration. Even if you only hit one foe per attack, it is still equivalent to a bit more than 8 pips of energy regeneration.
Combining this skill with skills that hit multiple times such as Volley or Dual Shot can return a large amount of energy for the cost.