Karthus and Kalista
Is it intended or a design flaw that Kalista's passive works with Karthus' passive?
Is it intended or a design flaw that Kalista's passive works with Karthus' passive?
Could you clarify? I'm not really sure what you mean.
Kalista shouldn't be able to autoattack Karthus since he can't be targeted when he's undead, so she shouldn't be able to jump around from that.
She can use her passive jump after casting her Q so maybe you saw that happen?
Otherwise, I'm not really sure what you are referring to.
she can ult him when he's dead
In that case, I'd recommend changing the wording of your original post. You ask if Kalista's passive can work with Karthus' passive instead of asking about her ultimate.