Groot is the worst in his class, Karnak is not the worst in his class, he still has utility, has true strike, poison resistance, hits very critical when focused (just need to increase damage) and in S3 reduces skill opponent's defense, if it uses suicides, it doesn't look bad.
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edit: just saw your other post, big congrats on the new Karnak 🥳🎉🎉
Thank you