I'm a bad master, friend dracos are ten times more effective than playing my own units, I suck at this game man

Case in point tamamo cat, I have her level max and gave her those fou things or whatever, she has class advantage but her damage is still pitiful and she dies really easily

Meanwhile friend dracos are invincible and one shot everything with buster cards or NP, what am I doing wrong? Is it just cat that sucks? or should I feed her grails?