I have for non-posted stories. A couple times actually. Each time spent a few weeks drafting cards, figuring out rules and balance, and even going some play testing.
The first one I made was more similar to magic and yugioh, but the second one was more similar to vanguard, (And a few other draft game ideas that were scrapped a lot faster). I play yugioh, and keep up-to-date with most major tcgs and play them online occasionally.
For obvious reasons, that is a lot of work, and I always decided to not post those types of stories as never had the time to do them consistently.