Very unique idea, I'm not sure how well card game and racing game mix with each other but I'd be curious how you evolve the concept in the future.
I'll echo what others have said the racing line as well as a more proper end to a race would have done a lot in actually making me want to try different decks to see which one leads to a better result, as is that's a bit hard to do
The current variety in cards is a bit limited to really see how good this concept is so I hope you'll add more types that synergies with each other.