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I couldn't find any explanation inside the game. Maybe it's the number of the turns passed since the beginning of the current combat?

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    It takes roughly two tries to understand how they work. Second try is when you have 0 energy.
    – user135338
    Apr 26, 2019 at 14:03

1 Answer 1

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The answer is:

Some cards can have X Energy cost. These cards consume all of your remaining Energy upon use, and their effect varies with how much Energy was consumed.

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