I know that there are many old sets out there that I've never heard of. Its always a pleasant surprise when I find them.
On the other hand, I find if very frustrating when I find a recent set that I'm not aware of. I like to think that I'm fairly plugged in as a collector and I get disappointed in myself when I find modern stuff that I didn't know about. That's what I have today.
In 2017, a set called Honus Bonus was released. The set's premise was to combine baseball cards and fantasy baseball. You can read more about it here.
The checklist of the set has 500 cards. How did I miss a set that big? Shame on me!
I found a Cubs team set and purchased it. It has 19 logo-less Cubs players. The card design is a bit odd, as the players are in black and white while the background is in color. I've seen cards do the opposite, making the background black and white, but not this. I don't think it makes the cards very attractive at all.
The product must not have been too successful as it was a one and done.