How to improve 'Thunderlords Decree' mastery

Hi! 30 seconds for a meh burst is pretty well... meh, cuz compared to Deathfire Torch, this one is lackluster. I have 2 suggestions for the Thunderlords Decree mastery: How about making the CD per enemy champ? Similar to Ekko's or Jarvan's passive for example, where a champion can't be hit by the ability for a certain amount of time. OR decrease the CD per AA (like Nocturne's Passive) What's your opinion?
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