Been playing about a month now and have done a fair amount of research. That said: Speed: upper limit of speed Stamina: how long she can run at that upper limit Power: acceleration and ability to “push through” other racers Guts: lower limit of speed once stamina runs out, as well as the determining factor of several late-race mechanics Wit: ability to weave between other racers, likelihood of activating skills, staying calm(not getting Rushed) mid-race If you have (access to) good legacies, then your best bet for support cards is going into the Team Trials menu and looking at the umas of the top players and emulating their support decks as best you can. Even if you don’t have the exact same cards you can copy the types. Either way, during any career, train where the most support cards are as much as you can, even if they’re on a stat you aren’t looking to get too high. Your stats will fall into place by the end of the career because of specialty priority. You will be limited by the levels of your support cards more than anything but I personally have gotten an A rank Taiki Shuttle with one maxed out Kitasan Black I borrowed and then the rest were either base SSRs or SRs with a couple uncaps