Quick, Arts, and Buster are 3 types of cards, with each Servant having a unique combination of 5.
For example, Kyrielight has 1 Quick, 2 Arts, and 2 Buster cards.
You're well balanced indeed, but you lack individuality.
I'm sorry, Director... I don't have much variation, but there are Servants that possess 3 of the same card. They may be powerful, but they lose tactical versatility in exchange.
I think I'm gonna concentrate on offense after all, so maybe I should form a party with lots of Busters...Wait, that means I can only use Berserkers......!