Karthus in AR URF

So I recently played an AR URF game with Tristana. The game was going well until Karthus hit level 6. Every 40 seconds my health jumped down to 60% and after he got some items it went down to 49%! This is RIDICULOUS. I got a {{item:3139}}, {{item:3156}} and {{item:3111}}. STILL HE CHUNKED ME OFF HALF MY HP! So Riot, why is he available in URF?
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