Regina seemed to think for a moment, then added, "I suppose you're familiar with the law of conservation of energy in physics? For hundreds of years in your world - I'm assuming here - there's been an understanding that you cannot create or destroy energy within an isolated system - you can only change it. Magic, of course, by its nature defies the laws of physics - if it didn't, it would be called science instead. But that law, on a certain level, still applies. You may use magic to create something from nothing in a physical sense, but in a metaphysical sense that act still takes its toll, must be balanced out. It still leaves a mark on the magician, or on their world - all magic comes at a price. This price is just a little more... poetic... than the laws of physics."
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Regina seemed to think for a moment, then added, "I suppose you're familiar with the law of conservation of energy in physics? For hundreds of years in your world - I'm assuming here - there's been an understanding that you cannot create or destroy energy within an isolated system - you can only change it. Magic, of course, by its nature defies the laws of physics - if it didn't, it would be called science instead. But that law, on a certain level, still applies. You may use magic to create something from nothing in a physical sense, but in a metaphysical sense that act still takes its toll, must be balanced out. It still leaves a mark on the magician, or on their world - all magic comes at a price. This price is just a little more... poetic... than the laws of physics."