Took a while, but apparently these are cards that you can combine with related cards on your roster to try and improve the base card. Bernie Carbo is a decent Diamond, but I suspect with 5 upgrades he could become a monster. As my sample shows, I don't currently have anything on my roster that can boost him currently (A 0.86% chance is no chance at all, LOL)
PS: The cards you use to boost the base card are lost.
Hmmm... interesting concept, but probably won't play a major part in plans until much later in the game.
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