Thank you for your inquiry, Hi I Like Cats. Um... As you can see the energy cost will always be 100 / 75 / 50 for the Copied Spell, regardless of whether there is mana cost, a different amount of energy cost or no cost at all.
However, if for some reason, there is a health cost, then that will be mimicked 
For the cool-down bit, yeah I think I need to look for either making them cost more energy or reducing energy.
Thanks and God Bless! 
League of Legends Community
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FoxMindedGuy
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Ashen Dragon
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Ashen Dragon
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FoxMindedGuy
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Frostbite Snipes
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Zurker
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FoxMindedGuy
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