Updating this thread, the Transcendent brand has continued and the more it does the more accessible the base older cards get. And the base cards are under 100 cards of each, so it is a nice type or player collectible.
Here is a 2017 Aaron:
And Koufax:
I've picked up a couple of Pedros too, on the cheap.
2017
2018:
Anyone else still going after these?