Gold Detector got easier for me when I realized that while the bullets themselves aren't static (or if they are, I'm really not paying attention), Nazrin's motion is a static pattern that I can follow to maximize my damage output and minimize the length of the card. (Move left, right, middle, right, left, middle. Card should be killed under Reimu B's power at this point, probably sooner with anyone else.) Other than that, mind the lasers and don't get walled. It's not -that- bad, but it's definitely not your typical trivial S1 "Night Bird"/"Lingering Cold"/"Firefly Phenomenon" spell card. Guard Pendulum bothers me more, if only because the card lasts forever due to Nazrin's cheap little shields.