I think this should be very limited. If every figure that could have an energy effect has one, then it kinda takes the charm away. I think it's a better accessory if it is a limited thing. Giving it to Thunder Punch He-Man made sense, because it visually showed his "action feature" when it was originally an audio thing; meaning the blast caps. What would have normally been just another variant, now has the effect enhancing this figure and giving it something special.
So, in that regard, I wouldn't want any of the figures on your lists to have effects, except Saurod; since his action feature involved actual sparks.