Seriously wondering, has Richard Garfield designed successful games after Magic: The Gathering? It’s probably hard to follow up that insane kind of success, especially if you hit it early.
His Star Wars TCG also officially ran for three years and spawned 15 years of fan development.
And then there's Netrunner (the CCG, not the better-known later Fantasy Flight LCG, Android: Netrunner, that used its mechanics). It was well-reviewed but seems to have only survived for three years as well. I expect we'll be seeing some comeback of Netrunner since Android: Netrunner recently had its license pulled for as-yet-unknown reasons.