Suggested Buff for Karthus

As we know, Karthus got nerfed heavily (for no reason) a few patches ago, and that kinda killed him. I think we should buff his ult a little bit, since there are so many better ults in the game with such lower cooldowns.

I suggest that for each champion Killed by Karthus' ult, the cooldown is refunded by 20%. I mean literally killed, not assists. This would grant more lenience towards Karthus if he decides to use his ult for a Kill in lane, or reward him if he times an ult perfectly to get 3 or 4 kills off of it.

It certainly wouldn't be OP. His ultimate doesn't deal an extreme amount of damage with tanks in the Meta and with Hexdrinker / Zhonyas as viable counterplay options. His ult does 800 damage At MOST to squishys mid-late game with 3-4 items + boots, and that's if they dont get Janna Shielded, bloodthirster shielded, Maw shielded, etc.

Not to mention his vulnerability to very Meta tanks like Malphite and Nautilus, so he would have to stay far from a fight to be able to ult (or die).