This crossed my mind, as I've been practicing with Karthus for the past few games.
Wouldn't Soraka counter Karthus hard as hell?
Assuming the Soraka was smart and her team didn't get into positions where she needed to use her ult so she could save her ult for Karthus' ult, that is.
Or would Karthus' ult scale quicker than hers and (typically) not matter (Obviously there's variables involved, with how much health his main target has and how much she heals for)
This is of course not saying he is dependent on his ult, but lets be honest it's a good advantage.
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