Calculator. Number cruncher. Cruncher.
The problem with "cruncher" is that you'd probably have to explain the etymology, since it of course sounds more like someone who does persuasive things to kneecaps.
Edit: I was trying for a phrase to convey the disdain more traditional magic-users, who thought of it as an Art rather than a Science, might feel for those who calculate the results in advance rather than empirically exploring possibilities.
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Big Brother is watching you. And damn, you are so bloody BORING.
The problem with "cruncher" is that you'd probably have to explain the etymology, since it of course sounds more like someone who does persuasive things to kneecaps.
Edit: I was trying for a phrase to convey the disdain more traditional magic-users, who thought of it as an Art rather than a Science, might feel for those who calculate the results in advance rather than empirically exploring possibilities.
-----
Big Brother is watching you. And damn, you are so bloody BORING.