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Or maybe it's "X" in the SA is static, whereas "X" or "*" in the numbers is dynamic?
So if there were a character with abilities X/5 and SA "Character has first strike ability while X is an even number," where X=the number of cards in your hand, would you say that the strength of the hero would change as I played enhancements during that battle, but the first strike ability would only be determined at the time the character entered battle, and never change?