Or even better, just scrap the whole retarded as fuck "card system" in the first place.
That's always the problem with these Korean MMOs. Gearing that relies on RNG on top of RNG is gay as fuck. RNG on top of RNG also isn't even necessarily the worst system ever, as long as you build in "pity" style systems to prevent people on the lowest end of the bell curve of RNG from getting completely raped out of their time.
Instead, they just entice you with purchasing your way through the RNG. If they could just start slowly eliminating that bullshit, I'd definitely considering returning. Because like you said, it really is a fucking amazing combat system.