>>723710068
Rainbow training+Spark inheritance
For example, right now you don't need guts, so you dump it. You need power but Speed also trains Power, so you leave it. Wit is increased naturally when you don't have a good training so you just "reroll" by training Wit and not energy.
For a medium race. you need around 750-800 stamina+1/2 gold recoveries to not gas out.
You can go 4speed cards+2stamina cards, or if you are staminamaxxing and can't reach max speed, go 5/1 between speed and stamina, and get all the stamina sparks you possibly can as parent.