I still don't get it. Is rolling for Kitasan Black's card a waste if you can't secure 3 dupes minimum? Or is it a good opportunity for greenhorns (who didn't reroll) to get plenty of support cards while rolling for a card that will be useful for the next two years?

Is a 6* uma a good starting point or do I have to grind careers for that 10% chance of getting a 3* spark?

s-she's smart!