EP Gulf Coast SP Slate/Olive #2/0 by Enrico Puglisi - EP Flies
Tarpon and other predators will love it. This one should be in most saltwater fly kits.
*Note from Salt Fly Pro: This fly is no longer available however EP has updated this series so a very similar one now exists with a different name, the new H&H Slate 3DX which was just released for 2021. It is very nice, check it out!