Who's Supposed to Run Omnistone anyway?

The only hypothetical benefit I can see to Omnistone is using Electrocute or Aftershock ( or technically Arcane Comet I suppose), and then getting another keystone quicker than the CDs for the aforementioned ones. But since the cycling is random, it'll probably take more than the Electrocute CD (25 seconds) to get another skill that's as impactful, unless you're somehow fighting constantly without killing each other, maybe Maokai vs. Zac.
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