Like the 20 Incher stonefly nymph? You will love it tied on a jig hook with better hooking power and weight. Perfect fly for anchors in heavy water.
I discovered the 20 Incher Nymph several years ago while on a Colorado fishing trip. It produced the largest brown of that trip and has since been a consistent producer throughout the Midwest Driftless and in several other states. I fish the fly in standard and jig hook versions, often using it as the point fly when contact or indicator nymphing. It's earned a permanent place in my fly box.