Ockam's Phaser

Yes: "entities must not be multiplied beyond necessity" (entia non sunt multiplicanda praeter necessitatem). Very nice. But a razor isn't quite what we want, here, now is it? The razor can slice away superluous entities, but they'll still be floating around, complicating our worldview. Better would be a device that fired a beam of sfnal energy at the superfluous entities, vaporising them so that we need not concern ourselves with them ever again ...