The only reason I can see Arf getting Derflinger is because she's the Gandalfr, given what Derf says (at least in the anime): He's always paired with Gandalfr. That'd be the only roadblock I can see for this instance, and you'd need a different method of getting them together because Arf wouldn't need to purchase a sword--she makes robots explode with her fists, so yeah.
Even if Arf didn't have enough magic to outright destroy the golem, she could easily go after its caster, or tell the others how to defeat something like it. Saito had little in the way of magical training after all... something Arf has plenty of experience in.
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